The Korean alphabet, known as Hangul, has been used to write the Korean language since its creation in the 15th century by King Sejong the Great. It may be written as Hangeul following the standard Romanization, it is the official writing system of Korea, both North. It is a co-official writing system in the Yanbian Korean Autonomous Prefecture and Changbai Korean Autonomous County in Jilin Province, China, it is sometimes used to write the Cia-Cia language spoken near the town of Indonesia. The Hangul alphabet consisted of 28 letters with 17 consonant letters and 11 vowel letters when it was created; as four became obsolete, the modern Hangul consists of total 24 letters with 14 consonant letters and 10 vowel letters. In North Korea the total is counted 40, it consists of 19 consonant letters and 21 vowel letters as it additionally includes 5 tense consonants and 20. The Korean letters are written in syllabic blocks with each alphabetic letter placed vertically and horizontally into a square dimension.
For example, the Korean word for "honeybee" is written 꿀벌, not ㄲㅜㄹㅂㅓㄹ. As it combines the features of alphabetic and syllabic writing systems, it has been described as an "alphabetic syllabary" by some linguists; as in traditional Chinese writing, Korean texts were traditionally written top to bottom, right to left, are still written this way for stylistic purposes. Today, it is written from left to right with spaces between words and western-style punctuation; some linguists consider it among the most phonologically faithful writing systems in use today. One interesting feature of Hangul is that the shapes of its consonants mimic the shapes of the speaker's mouth when pronouncing each consonant; the Korean alphabet was called Hunminjeong'eum, after the document that introduced the script to the Korean people in 1446. The Korean alphabet is called hangeul, a name coined by Korean linguist Ju Si-gyeong in 1912; the name combines the ancient Korean word han, meaning "great", geul, meaning "script".
The word han is used to refer to Korea in general, so the name means "Korean script". It has been romanized in multiple ways: Hangeul or han-geul in the Revised Romanization of Korean, which the South Korean government uses in English publications and encourages for all purposes. Han'gŭl in the McCune–Reischauer system, is capitalized and rendered without the diacritics when used as an English word, Hangul, as it appears in many English dictionaries. Hānkul in the Yale romanization, a system recommended for technical linguistic studies. In North Korea it is called Chosŏn'gŭl after Chosŏn, the North Korean name for Korea after the old name of Korea; the McCune–Reischauer system is used there. Until the mid-20th century, the Korean elite preferred to write using Chinese characters called Hanja, they referred to Hanja as jinseo or "true letters". Some accounts say the elite referred to the Korean alphabet derisively as'amkeul meaning "women's script", and'ahaetgeul meaning "children's script", though there is no written evidence of this.
Supporters of the Korean alphabet referred to it as jeong'eum meaning "correct pronunciation", gukmun meaning "national script", eonmun meaning "vernacular script". Before the creation of the new Korean alphabet, Koreans wrote using Classical Chinese alongside native phonetic writing systems that predate the modern Korean alphabet by hundreds of years, including Idu script, Hyangchal and Gakpil. However, due to fundamental differences between the Korean and Chinese languages, the large number of characters, many lower class Koreans were illiterate. To promote literacy among the common people, the fourth king of the Joseon dynasty, Sejong the Great created and promulgated a new alphabet; the Korean alphabet was designed so that people with little education could learn to write. A popular saying about the alphabet is, "A wise man can acquaint himself with them before the morning is over; the project was completed in late December 1443 or January 1444, described in 1446 in a document titled Hunminjeong'eum, after which the alphabet itself was named.
The publication date of the Hunminjeongeum, October 9, became Hangul Day in South Korea. Its North Korean equivalent, Chosŏn'gŭl Day, is on January 15. Another document published in 1446 and titled Hunminjeong'eum Haerye was discovered in 1940; this document explains that the design of the consonant letters is based on articulatory phonetics and the design of the vowel letters are based on the principles of yin and yang and vowel harmony. The Korean alphabet faced opposition in the 1440s by the literary elite, including politician Choe Manri and other Korean Confucian scholars, they believed. They saw the circulation of the Korean alphabet as a threat to their status. However, the Korean alphabet entered popular culture as King Sejong had intended, used by women and writers of popular fiction. King Yeonsangun banned the study and publication of the Korean alphabet in 1504, after a document criticizing the king entered the public. King Jungjong abolished the Ministry of Eonmun, a governmental institution related to Hangul research, in 1506.
The late 16th century, saw a revival of the Korean alphabet as gasa and sijo poetry flourished. In the 17th century, the Korean alphabet novels became a major genre. However, the use of the Korea
Chinese characters are logograms developed for the writing of Chinese. They have been adapted to write a number of other Asian languages, they remain a key component of the Japanese writing system and are used in the writing of Korean. They were used in Vietnamese and Zhuang. Collectively, they are known as CJK characters. Vietnamese is sometimes included, making the abbreviation CJKV. Chinese characters constitute. By virtue of their widespread current use in East Asia, historic use throughout the Sinosphere, Chinese characters are among the most adopted writing systems in the world by number of users. Chinese characters number in the tens of thousands, though most of them are minor graphic variants encountered only in historical texts. Studies in China have shown that functional literacy in written Chinese requires a knowledge of between three and four thousand characters. In Japan, 2,136 are taught through secondary school. Due to post-WWII simplifications of Kanji in Japan as well as the post-WWII simplifications of characters in China, the Chinese characters used in Japan today are distinct from those used in China in several respects.
There are various national standard lists of characters and pronunciations. Simplified forms of certain characters are used in mainland China and Malaysia. In Japan, common characters are written in post-WWII Japan-specific simplified forms, while uncommon characters are written in Japanese traditional forms, which are identical to Chinese traditional forms. In South Korea, when Chinese characters are used, they are in traditional form identical to those used in Taiwan and Hong Kong where the official writing system is traditional Chinese. Teaching of Chinese characters in South Korea starts in the 7th grade and continues until the 12th grade. In Old Chinese including Classical Chinese, most words were monosyllabic and there was a close correspondence between characters and words. In modern Chinese, the majority of Chinese words today consist of two or more characters. Rather, a character always corresponds to a single syllable, a morpheme. However, there are a few exceptions to this general correspondence, including bisyllabic morphemes, bimorphemic syllables and cases where a single character represents a polysyllabic word or phrase.
Modern Chinese has many homophones. A single character may have a range of meanings, or sometimes quite distinct meanings. Cognates in the several varieties of Chinese are written with the same character, they have similar meanings, but quite different pronunciations. In other languages, most today in Japanese and sometimes in Korean, characters are used to represent Chinese loanwords, to represent native words independently of the Chinese pronunciation, as purely phonetic elements based on their pronunciation in the historical variety of Chinese from which they were acquired; these foreign adaptations of Chinese pronunciation are known as Sino-Xenic pronunciations and have been useful in the reconstruction of Middle Chinese. When the script was first used in the late 2nd millennium BC, words of Old Chinese were monosyllabic, each character denoted a single word. Increasing numbers of polysyllabic words have entered the language from the Western Zhou period to the present day, it is estimated that about 25–30% of the vocabulary of classic texts from the Warring States period was polysyllabic, though these words were used far less than monosyllables, which accounted for 80–90% of occurrences in these texts.
The process has accelerated over the centuries as phonetic change has increased the number of homophones. It has been estimated that over two thirds of the 3,000 most common words in modern Standard Chinese are polysyllables, the vast majority of those being disyllables; the most common process has been to form compounds of existing words, written with the characters of the constituent words. Words have been created by adding affixes and borrowing from other languages. Polysyllabic words are written with one character per syllable. In most cases the character denotes. Many characters have multiple readings, with instances denoting different morphemes, sometimes with different pronunciations. In modern Standard Chinese, one fifth of the 2,400 most common characters have multiple pronunciations. For the 500 most common characters, the proportion rises to 30%; these readings are similar in sound and related in meaning. In the Old Chinese period, affixes could be added to a word to form a new word, written with the same character.
In many cases the pronunciations diverged due to subsequent sound change. For example, many additional readings have the Middle Chinese departing tone, the major sour
International Phonetic Alphabet
The International Phonetic Alphabet is an alphabetic system of phonetic notation based on the Latin alphabet. It was devised by the International Phonetic Association in the late 19th century as a standardized representation of the sounds of spoken language; the IPA is used by lexicographers, foreign language students and teachers, speech-language pathologists, actors, constructed language creators and translators. The IPA is designed to represent only those qualities of speech that are part of oral language: phones, phonemes and the separation of words and syllables. To represent additional qualities of speech, such as tooth gnashing and sounds made with a cleft lip and cleft palate, an extended set of symbols, the extensions to the International Phonetic Alphabet, may be used. IPA symbols are composed of one or more elements of two basic types and diacritics. For example, the sound of the English letter ⟨t⟩ may be transcribed in IPA with a single letter, or with a letter plus diacritics, depending on how precise one wishes to be.
Slashes are used to signal broad or phonemic transcription. Letters or diacritics are added, removed or modified by the International Phonetic Association; as of the most recent change in 2005, there are 107 letters, 52 diacritics and four prosodic marks in the IPA. These are shown in the current IPA chart, posted below in this article and at the website of the IPA. In 1886, a group of French and British language teachers, led by the French linguist Paul Passy, formed what would come to be known from 1897 onwards as the International Phonetic Association, their original alphabet was based on a spelling reform for English known as the Romic alphabet, but in order to make it usable for other languages, the values of the symbols were allowed to vary from language to language. For example, the sound was represented with the letter ⟨c⟩ in English, but with the digraph ⟨ch⟩ in French. However, in 1888, the alphabet was revised so as to be uniform across languages, thus providing the base for all future revisions.
The idea of making the IPA was first suggested by Otto Jespersen in a letter to Paul Passy. It was developed by Alexander John Ellis, Henry Sweet, Daniel Jones, Passy. Since its creation, the IPA has undergone a number of revisions. After revisions and expansions from the 1890s to the 1940s, the IPA remained unchanged until the Kiel Convention in 1989. A minor revision took place in 1993 with the addition of four letters for mid central vowels and the removal of letters for voiceless implosives; the alphabet was last revised in May 2005 with the addition of a letter for a labiodental flap. Apart from the addition and removal of symbols, changes to the IPA have consisted of renaming symbols and categories and in modifying typefaces. Extensions to the International Phonetic Alphabet for speech pathology were created in 1990 and adopted by the International Clinical Phonetics and Linguistics Association in 1994; the general principle of the IPA is to provide one letter for each distinctive sound, although this practice is not followed if the sound itself is complex.
This means that: It does not use combinations of letters to represent single sounds, the way English does with ⟨sh⟩, ⟨th⟩ and ⟨ng⟩, or single letters to represent multiple sounds the way ⟨x⟩ represents /ks/ or /ɡz/ in English. There are no letters that have context-dependent sound values, as do "hard" and "soft" ⟨c⟩ or ⟨g⟩ in several European languages; the IPA does not have separate letters for two sounds if no known language makes a distinction between them, a property known as "selectiveness". Among the symbols of the IPA, 107 letters represent consonants and vowels, 31 diacritics are used to modify these, 19 additional signs indicate suprasegmental qualities such as length, tone and intonation; these are organized into a chart. The letters chosen for the IPA are meant to harmonize with the Latin alphabet. For this reason, most letters modifications thereof; some letters are neither: for example, the letter denoting the glottal stop, ⟨ʔ⟩, has the form of a dotless question mark, derives from an apostrophe.
A few letters, such as that of the voiced pharyngeal fricative, ⟨ʕ⟩, were inspired by other writing systems. Despite its preference for harmonizing with the Latin script, the International Phonetic Association has admitted other letters. For example, before 1989, the IPA letters for click consonants were ⟨ʘ⟩, ⟨ʇ⟩, ⟨ʗ⟩, ⟨ʖ⟩, all of which were derived either from existing IPA letters, or from Latin and Greek letters. However, except for ⟨ʘ⟩, none of these letters were used among Khoisanists or Bantuists, as a result they were replaced by the more widespread symbols ⟨ʘ⟩, ⟨ǀ⟩, ⟨ǃ⟩, ⟨ǂ⟩, ⟨ǁ⟩ at the IPA Kiel Convention in 1989. Although the IPA diacritics are featural, there is little systemicity in the letter forms. A retroflex articulation is indicated with a right-swinging tail, as in ⟨ɖ ʂ ɳ⟩, implosion by a top hook, ⟨ɓ ɗ ɠ⟩, but other pseudo-featural elements are due to haphazard derivation and coincidence. For example, all nasal consonants but uvular ⟨ɴ⟩ are based on the form ⟨n⟩: ⟨m ɱ n ɳ ɲ ŋ⟩.
However, the similarity between ⟨m⟩ and ⟨n⟩ is a historical accident. Some of the new letters were ordinary Latin letters tu
Kanji are the adopted logographic Chinese characters that are used in the Japanese writing system. They are used alongside katakana; the Japanese term kanji for the Chinese characters means "Han characters". It is written with the same characters in the Chinese language to refer to the character writing system, hanzi. Chinese characters first came to Japan on official seals, swords, coins and other decorative items imported from China; the earliest known instance of such an import was the King of Na gold seal given by Emperor Guangwu of Han to a Yamato emissary in 57 AD. Chinese coins from the first century AD have been found in Yayoi period archaeological sites. However, the Japanese of that era had no comprehension of the script, would remain illiterate until the fifth century AD. According to the Nihon Shoki and Kojiki, a semi-legendary scholar called Wani was dispatched to Japan by the Kingdom of Baekje during the reign of Emperor Ōjin in the early fifth century, bringing with him knowledge of Confucianism and Chinese characters.
The earliest Japanese documents were written by bilingual Chinese or Korean officials employed at the Yamato court. For example, the diplomatic correspondence from King Bu of Wa to Emperor Shun of Liu Song in 478 has been praised for its skillful use of allusion. Groups of people called fuhito were organized under the monarch to read and write Classical Chinese. During the reign of Empress Suiko, the Yamato court began sending full-scale diplomatic missions to China, which resulted in a large increase in Chinese literacy at the Japanese court. In ancient times paper was so rare that people stenciled kanji onto thin, rectangular strips of wood; these wooden boards were used for communication between government offices, tags for goods transported between various countries, the practice of writing. The oldest written kanji in Japan discovered so far was written in ink on wood as a wooden strip dated to the 7th century, it is a record of trading for salt. The Japanese language had no written form at the time Chinese characters were introduced, texts were written and read only in Chinese.
During the Heian period, however, a system known as kanbun emerged, which involved using Chinese text with diacritical marks to allow Japanese speakers to restructure and read Chinese sentences, by changing word order and adding particles and verb endings, in accordance with the rules of Japanese grammar. Chinese characters came to be used to write Japanese words, resulting in the modern kana syllabaries. Around 650 AD, a writing system called man'yōgana evolved that used a number of Chinese characters for their sound, rather than for their meaning. Man'yōgana written in cursive style evolved into hiragana, or onna-de, that is, "ladies' hand," a writing system, accessible to women. Major works of Heian-era literature by women were written in hiragana. Katakana emerged via a parallel path: monastery students simplified man'yōgana to a single constituent element, thus the two other writing systems and katakana, referred to collectively as kana, are descended from kanji. In comparison to kana kanji are called mana.
In modern Japanese, kanji are used to write parts of the language such as nouns, adjective stems, verb stems, while hiragana are used to write inflected verb and adjective endings and as phonetic complements to disambiguate readings and miscellaneous words which have no kanji or whose kanji is considered obscure or too difficult to read or remember. Katakana are used for representing onomatopoeia, non-Japanese loanwords, the names of plants and animals, for emphasis on certain words. In 1946, after World War II and under the Allied Occupation of Japan, the Japanese government, guided by the Supreme Commander of the Allied Powers, instituted a series of orthographic reforms, to help children learn and to simplify kanji use in literature and periodicals; the number of characters in circulation was reduced, formal lists of characters to be learned during each grade of school were established. Some characters were given simplified glyphs, called shinjitai. Many variant forms of characters and obscure alternatives for common characters were discouraged.
These are guidelines, so many characters outside these standards are still known and used. The kyōiku kanji are 1,006 characters; the list only contained 881 characters. This was expanded to 996 characters in 1977, it was not until 1982 the list was expanded to its current size. The grade-level breakdown of these kanji is known as the gakunen-betsu kanji haitōhyō, or the gakushū kanji; the jōyō kanji are 2,136 characters consisting of all the Kyōiku kanji, plus 1,130 additional kanji taught in junior high and high school. In publishing, characters outside this category are given furigana; the jōyō kanji were introduced in 1981, replacing an older list of 1,850 characters known as the tōyō kanji, introduced in 1946. Numbering 1,945 characters, the jōyō kanji list was extended to 2,136 in 2010; some of the new characters were Jinmeiyō kanji. Since September 27, 2004, the jinmeiyō k
In fluid dynamics, turbulence or turbulent flow is fluid motion characterized by chaotic changes in pressure and flow velocity. It is in contrast to a laminar flow, which occurs when a fluid flows in parallel layers, with no disruption between those layers. Turbulence is observed in everyday phenomena such as surf, fast flowing rivers, billowing storm clouds, or smoke from a chimney, most fluid flows occurring in nature or created in engineering applications are turbulent. Turbulence is caused by excessive kinetic energy in parts of a fluid flow, which overcomes the damping effect of the fluid's viscosity. For this reason turbulence is realized in low viscosity fluids. In general terms, in turbulent flow, unsteady vortices appear of many sizes which interact with each other drag due to friction effects increases; this increases the energy needed to pump fluid through a pipe. Turbulence can be exploited, for example, by devices such as aerodynamic spoilers on aircraft that "spoil" the laminar flow to increase drag and reduce lift.
The onset of turbulence can be predicted by the dimensionless Reynolds number, the ratio of kinetic energy to viscous damping in a fluid flow. However, turbulence has long resisted detailed physical analysis, the interactions within turbulence create a complex phenomenon. Richard Feynman has described turbulence as the most important unsolved problem in classical physics. Smoke rising from a cigarette. For the first few centimeters, the smoke is laminar; the smoke plume becomes turbulent as its Reynolds number increases with increases in flow velocity and characteristic lengthscale. Flow over a golf ball. If the golf ball were smooth, the boundary layer flow over the front of the sphere would be laminar at typical conditions. However, the boundary layer would separate early, as the pressure gradient switched from favorable to unfavorable, creating a large region of low pressure behind the ball that creates high form drag. To prevent this, the surface is dimpled to promote turbulence; this results in higher skin friction, but it moves the point of boundary layer separation further along, resulting in lower drag.
Clear-air turbulence experienced during airplane flight, as well as poor astronomical seeing. Most of the terrestrial atmospheric circulation; the oceanic and atmospheric mixed intense oceanic currents. The flow conditions in many industrial equipment and machines; the external flow over all kinds of vehicles such as cars, airplanes and submarines. The motions of matter in stellar atmospheres. A jet exhausting from a nozzle into a quiescent fluid; as the flow emerges into this external fluid, shear layers originating at the lips of the nozzle are created. These layers separate the fast moving jet from the external fluid, at a certain critical Reynolds number they become unstable and break down to turbulence. Biologically generated. Snow fences work by inducing turbulence in the wind, forcing it to drop much of its snow load near the fence. Bridge supports in water. In the late summer and fall, when river flow is slow, water flows smoothly around the support legs. In the spring, when the flow is faster, a higher Reynolds number is associated with the flow.
The flow may start off laminar but is separated from the leg and becomes turbulent. In many geophysical flows, the flow turbulence is dominated by the coherent structures and turbulent events. A turbulent event is a series of turbulent fluctuations that contain more energy than the average flow turbulence; the turbulent events are associated with coherent flow structures such as eddies and turbulent bursting, they play a critical role in terms of sediment scour and transport in rivers as well as contaminant mixing and dispersion in rivers and estuaries, in the atmosphere. In the medical field of cardiology, a stethoscope is used to detect heart sounds and bruits, which are due to turbulent blood flow. In normal individuals, heart sounds are a product of turbulent flow as heart valves close. However, in some conditions turbulent flow can be audible due to other reasons, some of them pathological. For example, in advanced atherosclerosis, bruits can be heard in some vessels that have been narrowed by the disease process.
Turbulence in porous media became a debated subject. Turbulence is characterized by the following features: Irregularity Turbulent flows are always irregular. For this reason, turbulence problems are treated statistically rather than deterministically. Turbulent flow is chaotic. However, not all chaotic flows are turbulent. Diffusivity The available supply of energy in turbulent flows tends to accelerate the homogenization of fluid mixtures; the characteristic, responsible for the enhanced mixing and increased rates of mass and energy transports in a flow is called "diffusivity". Turbulent diffusion is described by a turbulent diffusion coefficient; this turbulent diffusion coefficient is defined in a phenomenological sense, by analogy with the molecular diffusivities, but it does not have a true physical meaning, being dependent on the flow conditions, not a property of the fluid itself. In addition, the turbulent diffusivity concept assumes a con
Wu is a group of linguistically similar and related varieties of Chinese spoken in the whole city of Shanghai, Zhejiang province and the southern half of Jiangsu province, as well as bordering areas. Major Wu varieties include those of Shanghai, Wuxi, Ningbo, Shaoxing, Wenzhou/Oujiang and Yongkang. Wu speakers, such as Chiang Kai-shek, Lu Xun and Cai Yuanpei, occupied positions of great importance in modern Chinese culture and politics. Wu can be found being used in Pingtan, Yue opera, Shanghai opera, the former, second only in national popularity to Peking opera. Wu is spoken in a large number of diaspora communities, with significant centers of immigration originating from Shanghai, Ningbo and Wenzhou. Suzhou has traditionally been the linguistic center of Wu and was the first place the distinct variety of Sinitic known as Wu developed. Suzhou dialect is considered to be the most linguistically representative of the family, it was the basis of the Wu lingua franca that developed in Shanghai leading to the formation of standard Shanghainese, which as a center of economic power and possessing the largest population of Wu speakers, has attracted the most attention.
Due to the influence of Shanghainese, Wu as a whole is incorrectly labelled in English as "Shanghainese", when introducing the language family to non-specialists. Wu is the more accurate terminology for the greater grouping that the Shanghainese variety is part of; the Wu group is well-known among linguists and sinologists as being one of the most internally diverse among the Sinitic groups, with little mutual intelligibility between varieties across subgroups. Among speakers of other Sinitic languages, Wu is subjectively judged to be soft and flowing. There is an idiom in Mandarin that describes these qualities of Wu speech: 吴侬软语, which means "the tender speech of Wu". On the other hand, some Wu varieties like Wenzhounese have gained notoriety for their high incomprehensibility to both Wu and non-Wu speakers alike, so much so that Wenzhounese was used during the Second World War to avoid Japanese interception. Wu dialects are typified linguistically as having preserved the voiced initials of Middle Chinese, having a majority of Middle Chinese tones undergo a register split, preserving a checked tone terminating in a glottal stop, although some dialects maintain the tone without the stop and certain dialects of Southern Wu have undergone or are starting to undergo a process of devoicing.
The historical relations which determine Wu classification consist in two main factors: firstly, both in terms of physical geography and distance south or away from Mandarin, that is, Wu varieties are part of a Wu–Min dialect continuum from southern Jiangsu to Fujian and Chaoshan. The second factor is the drawing of historical administrative boundaries, which, in addition to physical barriers, limit mobility and in the majority of cases more or less determine the boundary of a Wu dialect. Wu Chinese, along with Min, is of great significance to historical linguists due to their retention of many ancient features; these two languages have proven pivotal in determining the phonetic history of the Chinese languages. More pressing concerns of the present are those of language preservation. Many within and outside of China fear that the increased usage of Mandarin may altogether supplant the languages that have no written form, legal protection, or official status and are barred from use in public discourse.
However, many analysts believe that a stable state of diglossia will endure for at least several generations if not indefinitely. Speakers of Wu varieties are unaware of this term for their speech since the term "Wu" is a recent classificatory imposition on what are less defined and heterogeneous natural forms. Saying one speaks Wu is akin to saying one speaks a Romance language, it is not a defined entity like Standard Mandarin or Hochdeutsch. Most speakers are only vaguely aware of their local variety's affinities with other classified varieties and will only refer to their local Wu variety rather than the dialect family, they do this by affixing'話' Wo to their location's endonym. For example, 溫州話 Wēnzhōuhuà is used for Wenzhounese. Affixing 閒話 xiánhuà is common and more typical of the Taihu division, as in 嘉興閒話 Kashin'ghenwo for Jiaxing dialect. Wu: the formal name and standard reference in dialectology literature. Wu dialects: another scholastic term. Northern Wu: Wu spoken in the north of Zhejiang, the city of Shanghai and parts of Jiangsu, comprising the Taihu and the Taizhou divisions.
It by default includes the Xuanzhou division in Anhui as well, however this division is neglected in Northern Wu discussions. Southern Wu: Wu spoken in southern Zhejiang and periphery, comprising the Oujiang and Chuqu divisions. Western Wu (simplified Chinese: 西部吴语.
Manner of articulation
In articulatory phonetics, the manner of articulation is the configuration and interaction of the articulators when making a speech sound. One parameter of manner is stricture, that is, how the speech organs approach one another. Others include those involved in the r-like sounds, the sibilancy of fricatives; the concept of manner is used in the discussion of consonants, although the movement of the articulators will greatly alter the resonant properties of the vocal tract, thereby changing the formant structure of speech sounds, crucial for the identification of vowels. For consonants, the place of articulation and the degree of phonation of voicing are considered separately from manner, as being independent parameters. Homorganic consonants, which have the same place of articulation, may have different manners of articulation. Nasality and laterality are included in manner, but some phoneticians, such as Peter Ladefoged, consider them to be independent. Manners of articulation with substantial obstruction of the airflow are called obstruents.
These are prototypically voiceless, but voiced obstruents are common as well. Manners without such obstruction are called sonorants. Voiceless sonorants are uncommon, but are found in Welsh and Classical Greek, in Standard Tibetan, the "wh" in those dialects of English that distinguish "which" from "witch". Sonorants may be called resonants, some linguists prefer that term, restricting the word'sonorant' to non-vocoid resonants. Another common distinction is between continuants. From greatest to least stricture, speech sounds may be classified along a cline as stop consonants, fricative consonants and vowels. Affricates behave as if they were intermediate between stops and fricatives, but phonetically they are sequences of a stop and fricative. Over time, sounds in a language may move along this cline toward less stricture in a process called lenition, or towards more stricture in a process called fortition. Sibilants are distinguished from other fricatives by the shape of the tongue and how the airflow is directed over the teeth.
Fricatives at coronal places of articulation may be sibilant or non-sibilant, sibilants being the more common. Flaps are similar to brief stops. However, their articulation and behavior are distinct enough to be considered a separate manner, rather than just length; the main articulatory difference between flaps and stops is that, due to the greater length of stops compared to flaps, a build-up of air pressure occurs behind a stop which does not occur behind a flap. This means that when the stop is released, there is a burst of air as the pressure is relieved, while for flaps there is no such burst. Trills involve the vibration of one of the speech organs. Since trilling is a separate parameter from stricture, the two may be combined. Increasing the stricture of a typical trill results in a trilled fricative. Trilled affricates are known. Nasal airflow may be added as an independent parameter to any speech sound, it is most found in nasal occlusives and nasal vowels, but nasalized fricatives and approximants are found.
When a sound is not nasal, it is called oral. Laterality is the release of airflow at the side of the tongue; this can be combined with other manners, resulting in lateral approximants, lateral flaps, lateral fricatives and affricates. Stop, an oral occlusive, where there is occlusion of the oral vocal tract, no nasal air flow, so the air flow stops completely. Examples include English /p t k/ and /b d ɡ/. If the consonant is voiced, the voicing is the only sound made during occlusion. What we hear as a /p/ or /k/ is the effect that the onset of the occlusion has on the preceding vowel, as well as the release burst and its effect on the following vowel; the shape and position of the tongue determine the resonant cavity that gives different stops their characteristic sounds. All languages have stops. Nasal, a nasal occlusive, where there is occlusion of the oral tract, but air passes through the nose; the shape and position of the tongue determine the resonant cavity that gives different nasals their characteristic sounds.
Examples include English /m, n/. Nearly all languages have nasals, the only exceptions being in the area of Puget Sound and a single language on Bougainville Island. Fricative, sometimes called spirant, where there is continuous frication at the place of articulation. Examples include etc.. Most languages have fricatives, though many have only an /s/. However, the Indigenous Australian languages are completely devoid of fricatives of any kind. Sibilants are a type of fricative where the airflow is guided by a groove in the tongue toward the teeth, creating a high-pitched and distinctive sound; these are by far the most common fricatives. Fricatives at coronal places of articulation are though not always, sibilants. English sibilants include /s/ and /z/. Lateral fricatives are a rare type of fricative, where the frication occurs on one or both sides of the edge of th