Earth (classical element)
Earth is one of the classical elements, in some systems numbering four along with air and water. Earth is one of the four classical elements in science, it was associated with qualities of heaviness and the terrestrial world. Due to the hero cults, chthonic underworld deities, the element of earth is associated with the sensual aspects of both life and death in occultism. Empedocles of Acragas proposed four archai by which to understand the cosmos: fire, air and earth. Plato believed the elements were geometric forms and he assigned the cube to the element of earth in his dialogue Timaeus. Aristotle believed earth was the heaviest element, his theory of natural place suggested that any earth–laden substances, would fall straight down, towards the center of the cosmos. In Classical Greek and Roman myth, various goddesses represented the Earth, seasons and fertility, including Demeter and Persephone. In ancient Greek medicine, each of the four humours became associated with an element. Black bile was the humor identified with earth, since both were dry.
Other things associated with earth and black bile in ancient and medieval medicine included the season of fall, since it increased the qualities of cold and aridity. In alchemy, earth was believed to be dry, secondarily cold. Beyond those classical attributes, the chemical substance salt, was associated with earth and its alchemical symbol was a downward-pointing triangle, bisected by a horizontal line. Prithvi is the Hindu mother goddess. According to one such tradition, she is the personification of the Earth itself; as Prithvi Mata, or "Mother Earth", she contrasts with Dyaus Pita, "father sky". In the Rigveda and sky are addressed as a duality indicated by the idea of two complementary "half-shells." In addition, the element Earth is associated with Budha or Mercury who represents communication, business and other practical matters. Earth and the other Greek classical elements were incorporated into the Golden Dawn system. Zelator is the elemental grade attributed to earth; the elemental weapon of earth is the Pentacle.
Each of the elements has several associated spiritual beings. The archangel of earth is Uriel, the angel is Phorlakh, the ruler is Kerub, the king is Ghob, the earth elementals are called gnomes. Earth is considered to be passive. Many of these associations have since spread throughout the occult community, it is sometimes represented by its Tattva or by a downward pointing triangle with a horizontal line through it. Earth is one of the five elements that appear in most Pagan traditions. Wicca in particular was influenced by the Golden Dawn system of magic, Aleister Crowley's mysticism, in turn inspired by the Golden Dawn. In East Asia, metal is sometimes seen as the equivalent of earth and is represented by the White Tiger, known as 白虎 in Chinese, Byakko in Japanese, Bạch Hổ in Vietnamese and Baekho in Korean. Earth is represented in the Aztec religion by a house. Gaia Mother goddess Mother nature Pherecydes of Syros Different versions of the classical elements
The Punjab spelled Panjab, is a geopolitical and historical region in South Asia in the northern part of the Indian subcontinent, comprising areas of eastern Pakistan and northern India. The boundaries of the region focus on historical accounts; until the Partition of Punjab in 1947, the British Punjab Province encompassed the present-day Indian states and union territories of Punjab, Himachal Pradesh and Delhi. It bordered the Balochistan and Pashtunistan regions to the west, Kashmir to the north, the Hindi Belt to the east, Rajasthan and Sindh to the south; the people of the Punjab today are called Panjabis, their principal language is Punjabi. The main religions of the Indian Punjab region are Hinduism; the main religions of the Pakistani Punjab region is Islam. Other religious groups are Christianity, Zoroastrianism and Ravidassia; the Punjab region has been inhabited by the Indus Valley Civilisation, Indo-Aryan peoples, Indo-Scythians, has seen numerous invasions by the Persians, Kushans, Timurids, Pashtuns and others.
Historic foreign invasions targeted the most productive central region of the Punjab known as the Majha region, the bedrock of Punjabi culture and traditions. The Punjab region is referred to as the breadbasket in both India and Pakistan; the region was called Sapta Sindhu, the Vedic land of the seven rivers flowing into the ocean. The origin of the word Punjab can be traced to the Sanskrit "pancha-nada", which means "five rivers", is used as the name of a region in the Mahabharata; the name of the region, Punjab, is a compound of two Persian words, Panj and āb, introduced to the region by the Turko-Persian conquerors of India, more formally popularised during the Mughal Empire. Punjab thus means "The Land of Five Waters", referring to the rivers Jhelum, Ravi and Beas. All are tributaries of the Sutlej being the largest; the Greeks referred to the region as Pentapotamia. There are two main definitions of the Punjab region: the 1947 definition and the older 1846–1849 definition. A third definition incorporates both the 1947 and the older definitions but includes northern Rajasthan on a linguistic basis and ancient river movements.
The 1947 definition defines the Punjab region with reference to the dissolution of British India whereby the British Punjab Province was partitioned between India and Pakistan. In Pakistan, the region now includes Islamabad Capital Territory. In India, it includes the Punjab state, Chandigarh and Himachal Pradesh. Using the 1947 definition, the Punjab borders the Balochistan and Pashtunistan regions to the west, Kashmir to the north, the Hindi Belt to the east, Rajasthan and Sindh to the south. Accordingly, the Punjab region is diverse and stretches from the hills of the Kangra Valley to the plains and to the Cholistan Desert. Using the 1947 definition of the Punjab region, some of the major cities of the area include Lahore and Ludhiana; the older definition of the Punjab region focuses on the collapse of the Sikh Empire and the creation of the British Punjab province between 1846 and 1849. According to this definition, the Punjab region incorporates, in Pakistan, Azad Kashmir including Bhimber and Mirpur and parts of Khyber Pakhtunkhwa.
In India the wider definition includes parts of Jammu Division. Using the older definition of the Punjab region, the Punjab region covers a large territory and can be divided into five natural areas: the eastern mountainous region including Jammu Division and Azad Kashmir; the formation of the Himalayan Range of mountains to the east and north-east of the Punjab is the result of a collision between the north-moving Indo-Australian Plate and the Eurasian Plate. The plates are still moving together, the Himalayas are rising by about 5 millimetres per year; the upper regions are snow-covered the whole year. Lower ranges of hills run parallel to the mountains; the Lower Himalayan Range runs from north of Rawalpindi through Jammu and Kashmir, Himachal Pradesh and further south. The mountains are young, are eroding rapidly; the Indus and the five rivers of the Punjab have their sources in the mountain range and carry loam and silt down to the rich alluvial plains, which are fertile. According to the older definition, some of the major cities include Jammu and parts of Delhi.
The third definition of the Punjab region adds to the definitions cited above and includes parts of Rajasthan on linguistic lines and takes into consideration the location of the Punjab rivers in ancient times. In particular, the Sri Ganganagar and Hanumangarh districts are included in the Punjab region; the climate is a factor contributing to the economy of the Punjab. It is not uniform over the whole region, with the sections adjacent to the Himalayas receiving heavier rainfall than those at a distance. There are two transitional periods. During the hot season from mid-April to the end of June, the temperature may reach 49 °C; the monsoon season, from July to September, is a period of heavy rainfall, providing
In chemistry, a salt is an ionic compound that can be formed by the neutralization reaction of an acid and a base. Salts are composed of related numbers of cations and anions so that the product is electrically neutral; these component ions can be inorganic, such as organic, such as acetate. Salts can be classified in a variety of ways. Salts that produce hydroxide ions when dissolved in water are called alkali salts. Salts that produce acidic solutions are acidic salts. Neutral salts are those salts that are neither basic. Zwitterions contain an anionic and a cationic centres in the same molecule, but are not considered to be salts. Examples of zwitterions include amino acids, many metabolites and proteins. Solid salts tend to be transparent. In many cases, the apparent opacity or transparency are only related to the difference in size of the individual monocrystals. Since light reflects from the grain boundaries, larger crystals tend to be transparent, while the polycrystalline aggregates look like white powders.
Salts exist in many different colors, which arise either from the cations. For example: sodium chromate is yellow by virtue of the chromate ion potassium dichromate is orange by virtue of the dichromate ion cobalt nitrate is red owing to the chromophore of hydrated cobalt. copper sulfate is blue because of the copper chromophore potassium permanganate has the violet color of permanganate anion. Nickel chloride is green of sodium chloride, magnesium sulfate heptahydrate are colorless or white because the constituent cations and anions do not absorb in the visible part of the spectrumFew minerals are salts because they would be solubilized by water. Inorganic pigments tend not to be salts, because insolubility is required for fastness; some organic dyes are salts, but they are insoluble in water. Different salts can elicit all five basic tastes, e.g. salty, sour and umami or savory. Salts of strong acids and strong bases are non-volatile and odorless, whereas salts of either weak acids or weak bases may smell like the conjugate acid or the conjugate base of the component ions.
That slow, partial decomposition is accelerated by the presence of water, since hydrolysis is the other half of the reversible reaction equation of formation of weak salts. Many ionic compounds exhibit significant solubility in water or other polar solvents. Unlike molecular compounds, salts dissociate in solution into cationic components; the lattice energy, the cohesive forces between these ions within a solid, determines the solubility. The solubility is dependent on how well each ion interacts with the solvent, so certain patterns become apparent. For example, salts of sodium and ammonium are soluble in water. Notable exceptions include potassium cobaltinitrite. Most nitrates and many sulfates are water-soluble. Exceptions include barium sulfate, calcium sulfate, lead sulfate, where the 2+/2− pairing leads to high lattice energies. For similar reasons, most alkali metal carbonates are not soluble in water; some soluble carbonate salts are: potassium carbonate and ammonium carbonate. Salts are characteristically insulators.
Molten salts or solutions of salts conduct electricity. For this reason, liquified salts and solutions containing dissolved salts are called electrolytes. Salts characteristically have high melting points. For example, sodium chloride melts at 801 °C; some salts with low lattice energies are liquid near room temperature. These include molten salts, which are mixtures of salts, ionic liquids, which contain organic cations; these liquids exhibit unusual properties as solvents. The name of a salt starts with the name of the cation followed by the name of the anion. Salts are referred to only by the name of the cation or by the name of the anion. Common salt-forming cations include: Ammonium NH+4 Calcium Ca2+ Iron Fe2+ and Fe3+ Magnesium Mg2+ Potassium K+ Pyridinium C5H5NH+ Quaternary ammonium NR+4, R being an alkyl group or an aryl group Sodium Na+ Copper Cu2+Common salt-forming anions include: Acetate CH3COO− Carbonate CO2−3 Chloride Cl− Citrate HOC2 Cyanide C≡N− Fluoride F− Nitrate NO−3 Nitrite NO−2 Oxide O2− Phosphate PO3−4 Sulfate SO2−4 Salts with varying number of hydrogen atoms, with respect to the parent acid, replaced by cations can be referred to as monobasic, dibasic or tribasic salts: Sodium phosphate monobasic Sodium phosphate dibasic Sodium phosphate tribasic Salts are formed by a chemical reaction between: A base and an acid, e.g. NH3 + HCl → NH4Cl A metal and an acid, e.g. Mg + H2SO4 → MgSO4 + H2 A metal and a non-metal, e.g. Ca + Cl2 → CaCl2 A base and an a
Aether (classical element)
According to ancient and medieval science, aether spelled æther or ether and called quintessence, is the material that fills the region of the universe above the terrestrial sphere. The concept of aether was used in several theories to explain several natural phenomena, such as the traveling of light and gravity. In the late 19th century, physicists postulated that aether permeated all throughout space, providing a medium through which light could travel in a vacuum, but evidence for the presence of such a medium was not found in the Michelson–Morley experiment, this result has been interpreted as meaning that no such luminiferous aether exists; the word αἰθήρ in Homeric Greek means "pure, fresh air" or "clear sky". In Greek mythology, it was thought to be the pure essence that the gods breathed, filling the space where they lived, analogous to the air breathed by mortals, it is personified as a deity, the son of Erebus and Nyx in traditional Greek mythology. Aether is related to αἴθω "to incinerate", intransitive "to burn, to shine".
In Plato's Timaeus speaking about air, Plato mentions that "there is the most translucent kind, called by the name of aether". But otherwise he adopted the classical system of four elements. Aristotle, Plato's student at the Akademia, agreed on this point with his former mentor, emphasizing additionally that fire sometimes has been mistaken for aether. However, in his Book On the Heavens he introduced a new "first" element to the system of the classical elements of Ionian philosophy, he noted that the four terrestrial classical elements were subject to change and moved linearly. The first element however, located in the celestial regions and heavenly bodies, moved circularly and had none of the qualities the terrestrial classical elements had, it was neither neither wet nor dry. With this addition the system of elements was extended to five and commentators started referring to the new first one as the fifth and called it aether, a word that Aristotle had not used. Aether did not follow Aristotelian physics either.
Aether was incapable of motion of quality or motion of quantity. Aether was only capable of local motion. Aether moved in circles, had no contrary, or unnatural, motion. Aristotle noted that crystalline spheres made of aether held the celestial bodies; the idea of crystalline spheres and natural circular motion of aether led to Aristotle's explanation of the observed orbits of stars and planets in circular motion in crystalline aether. Medieval scholastic philosophers granted aether changes of density, in which the bodies of the planets were considered to be more dense than the medium which filled the rest of the universe. Robert Fludd stated that the aether was of the character that it was "subtler than light". Fludd cites the 3rd-century view of Plotinus, concerning the aether as non-material. See Arche. Quintessence is the Latinate name of the fifth element used by medieval alchemists for a medium similar or identical to that thought to make up the heavenly bodies, it was noted that there was little presence of quintessence within the terrestrial sphere.
Due to the low presence of quintessence, earth could be affected by what takes place within the heavenly bodies. This theory was developed in the 14th century text The testament of Lullius, attributed to Ramon Llull; the use of quintessence became popular within medieval alchemy. Quintessence stemmed from the medieval elemental system, which consisted of the four classical elements, aether, or quintessence, in addition to two chemical elements representing metals: sulphur, "the stone which burns", which characterized the principle of combustibility, mercury, which contained the idealized principle of metallic properties; this elemental system spread throughout all of Europe and became popular with alchemists in medicinal alchemy. Medicinal alchemy sought to isolate quintessence and incorporate it within medicine and elixirs. Due to quintessence's pure and heavenly quality, it was thought that through consumption one may rid oneself of any impurities or illnesses. In The book of Quintessence, a 15th-century English translation of a continental text, quintessence was used as a medicine for many of man's illnesses.
A process given for the creation of quintessence is distillation of alcohol seven times. Over the years, the term quintessence has become synonymous with elixirs, medicinal alchemy, the philosopher's stone itself. With the 18th century physics developments, physical models known as "aether theories" made use of a similar concept for the explanation of the propagation of electromagnetic and gravitational forces; as early as the 1670s, Newton used the idea of aether to help match observations to strict mechanical rules of his physics. However, the early modern aether had little in common with the aether of classical elements from which the name was borrowed; these aether theories are considered to be scientifically obsolete, as the development of special relativity showed that Maxwell's equations do not require the aether for the transmission of these forces. However, Einstein himself noted that his own model which replaced these theories could itself be thought of as an aether, as it implied that the empty space between objects had its own physical properties.
Despite the early modern aether models being superseded by general relativity some physicists have attempted to reintroduce the concept of aether in an attempt to address perceived deficiencies in current physical models. One proposed model of dark energy has been named "quintess
Mercury is a chemical element with symbol Hg and atomic number 80. It is known as quicksilver and was named hydrargyrum. A heavy, silvery d-block element, mercury is the only metallic element, liquid at standard conditions for temperature and pressure. Mercury occurs in deposits throughout the world as cinnabar; the red pigment vermilion is obtained by synthetic mercuric sulfide. Mercury is used in thermometers, manometers, sphygmomanometers, float valves, mercury switches, mercury relays, fluorescent lamps and other devices, though concerns about the element's toxicity have led to mercury thermometers and sphygmomanometers being phased out in clinical environments in favor of alternatives such as alcohol- or galinstan-filled glass thermometers and thermistor- or infrared-based electronic instruments. Mechanical pressure gauges and electronic strain gauge sensors have replaced mercury sphygmomanometers. Mercury remains in use in scientific research applications and in amalgam for dental restoration in some locales.
It is used in fluorescent lighting. Electricity passed through mercury vapor in a fluorescent lamp produces short-wave ultraviolet light, which causes the phosphor in the tube to fluoresce, making visible light. Mercury poisoning can result from exposure to water-soluble forms of mercury, by inhalation of mercury vapor, or by ingesting any form of mercury. Mercury is a silvery-white liquid metal. Compared to other metals, it is a fair conductor of electricity, it has a freezing point of −38.83 °C and a boiling point of 356.73 °C, both the lowest of any stable metal, although preliminary experiments on copernicium and flerovium have indicated that they have lower boiling points. Upon freezing, the volume of mercury decreases by 3.59% and its density changes from 13.69 g/cm3 when liquid to 14.184 g/cm3 when solid. The coefficient of volume expansion is 181.59 × 10−6 at 0 °C, 181.71 × 10−6 at 20 °C and 182.50 × 10−6 at 100 °C. Solid mercury can be cut with a knife. A complete explanation of mercury's extreme volatility delves deep into the realm of quantum physics, but it can be summarized as follows: mercury has a unique electron configuration where electrons fill up all the available 1s, 2s, 2p, 3s, 3p, 3d, 4s, 4p, 4d, 4f, 5s, 5p, 5d, 6s subshells.
Because this configuration resists removal of an electron, mercury behaves to noble gases, which form weak bonds and hence melt at low temperatures. The stability of the 6s shell is due to the presence of a filled 4f shell. An f shell poorly screens the nuclear charge that increases the attractive Coulomb interaction of the 6s shell and the nucleus; the absence of a filled inner f shell is the reason for the somewhat higher melting temperature of cadmium and zinc, although both these metals still melt and, in addition, have unusually low boiling points. Mercury does not react with most acids, such as dilute sulfuric acid, although oxidizing acids such as concentrated sulfuric acid and nitric acid or aqua regia dissolve it to give sulfate and chloride. Like silver, mercury reacts with atmospheric hydrogen sulfide. Mercury reacts with solid sulfur flakes. Mercury dissolves many metals such as silver to form amalgams. Iron is an exception, iron flasks have traditionally been used to trade mercury.
Several other first row transition metals with the exception of manganese and zinc are resistant in forming amalgams. Other elements that do not form amalgams with mercury include platinum. Sodium amalgam is a common reducing agent in organic synthesis, is used in high-pressure sodium lamps. Mercury combines with aluminium to form a mercury-aluminium amalgam when the two pure metals come into contact. Since the amalgam destroys the aluminium oxide layer which protects metallic aluminium from oxidizing in-depth small amounts of mercury can corrode aluminium. For this reason, mercury is not allowed aboard an aircraft under most circumstances because of the risk of it forming an amalgam with exposed aluminium parts in the aircraft. Mercury embrittlement is the most common type of liquid metal embrittlement. There are seven stable isotopes of mercury, with 202Hg being the most abundant; the longest-lived radioisotopes are 194Hg with a half-life of 444 years, 203Hg with a half-life of 46.612 days. Most of the remaining radioisotopes have half-lives.
199Hg and 201Hg are the most studied NMR-active nuclei, having spins of 1⁄2 and 3⁄2 respectively. Hg is the modern chemical symbol for mercury, it comes from hydrargyrum, a Latinized form of the Greek word ὑδράργυρος, a compound word meaning "water-silver" – since it is liquid like water and shiny like silver. The element was named after the Roman god Mercury, known for his mobility, it is associated with the planet Mercury. Mercury is the only metal for which the al
Sanskrit is a language of ancient India with a history going back about 3,500 years. It is the primary liturgical language of Hinduism and the predominant language of most works of Hindu philosophy as well as some of the principal texts of Buddhism and Jainism. Sanskrit, in its variants and numerous dialects, was the lingua franca of ancient and medieval India. In the early 1st millennium CE, along with Buddhism and Hinduism, Sanskrit migrated to Southeast Asia, parts of East Asia and Central Asia, emerging as a language of high culture and of local ruling elites in these regions. Sanskrit is an Old Indo-Aryan language; as one of the oldest documented members of the Indo-European family of languages, Sanskrit holds a prominent position in Indo-European studies. It is related to Greek and Latin, as well as Hittite, Old Avestan and many other extinct languages with historical significance to Europe, West Asia, Central Asia, South Asia, it traces its linguistic ancestry to the Proto-Indo-Aryan language, Proto-Indo-Iranian and the Proto-Indo-European languages.
Sanskrit is traceable to the 2nd millennium BCE in a form known as the Vedic Sanskrit, with the Rigveda as the earliest known composition. A more refined and standardized grammatical form called the Classical Sanskrit emerged in mid-1st millennium BCE with the Aṣṭādhyāyī treatise of Pāṇini. Sanskrit, though not Classical Sanskrit, is the root language of many Prakrit languages. Examples include numerous modern daughter Northern Indian subcontinental languages such as Hindi, Bengali and Nepali; the body of Sanskrit literature encompasses a rich tradition of philosophical and religious texts, as well as poetry, drama, scientific and other texts. In the ancient era, Sanskrit compositions were orally transmitted by methods of memorisation of exceptional complexity and fidelity; the earliest known inscriptions in Sanskrit are from the 1st-century BCE, such as the few discovered in Ayodhya and Ghosundi-Hathibada. Sanskrit texts dated to the 1st millennium CE were written in the Brahmi script, the Nāgarī script, the historic South Indian scripts and their derivative scripts.
Sanskrit is one of the 22 languages listed in the Eighth Schedule of the Constitution of India. It continues to be used as a ceremonial and ritual language in Hinduism and some Buddhist practices such as hymns and chants; the Sanskrit verbal adjective sáṃskṛta- is a compound word consisting of sam and krta-. It connotes a work, "well prepared and perfect, sacred". According to Biderman, the perfection contextually being referred to in the etymological origins of the word is its tonal qualities, rather than semantic. Sound and oral transmission were valued quality in ancient India, its sages refined the alphabet, the structure of words and its exacting grammar into a "collection of sounds, a kind of sublime musical mold", states Biderman, as an integral language they called Sanskrit. From late Vedic period onwards, state Annette Wilke and Oliver Moebus, resonating sound and its musical foundations attracted an "exceptionally large amount of linguistic and religious literature" in India; the sound was visualized as "pervading all creation", another representation of the world itself, the "mysterious magnum" of the Hindu thought.
The search for perfection in thought and of salvation was one of the dimensions of sacred sound, the common thread to weave all ideas and inspirations became the quest for what the ancient Indians believed to be a perfect language, the "phonocentric episteme" of Sanskrit. Sanskrit as a language competed with numerous less exact vernacular Indian languages called Prakritic languages; the term prakrta means "original, normal, artless", states Franklin Southworth. The relationship between Prakrit and Sanskrit is found in the Indian texts dated to the 1st millennium CE. Patanjali acknowledged that Prakrit is the first language, one instinctively adopted by every child with all its imperfections and leads to the problems of interpretation and misunderstanding; the purifying structure of the Sanskrit language removes these imperfections. The early Sanskrit grammarian Dandin states, for example, that much in the Prakrit languages is etymologically rooted in Sanskrit but involve "loss of sounds" and corruptions that result from a "disregard of the grammar".
Dandin acknowledged that there are words and confusing structures in Prakrit that thrive independent of Sanskrit. This view is found in the writing of the author of the ancient Natyasastra text; the early Jain scholar Namisadhu acknowledged the difference, but disagreed that the Prakrit language was a corruption of Sanskrit. Namisadhu stated that the Prakrit language was the purvam and they came to women and children, that Sanskrit was a refinement of the Prakrit through a "purification by grammar". Sanskrit belongs to the Indo-European family of languages, it is one of the three ancient documented languages that arose from a common root language now referred to as the Proto-Indo-European language: Vedic Sanskrit. Mycenaean Greek and Ancient Greek. Mycenaean Greek is the older recorded form of Greek, but the limited material that has survived has a ambiguous writing system. More important to Indo-European studies is Ancient Greek, documented extensively beginning with the two Homeric poems. Hittite.
This is the earliest-recorded of all Indo-European languages, distinguishable into Old Hittite, Middle Hittite and Neo-Hittite. I
Hindi, or Modern Standard Hindi is a standardised and Sanskritised register of the Hindustani language. Hindi, written in the Devanagari script, is one of the official languages of India, along with the English language, it is one of the 22 scheduled languages of the Republic of India. However, it is not the national language of India because no language was given such a status in the Indian constitution. Hindi is the lingua franca of the Hindi belt, to a lesser extent other parts of India. Outside India, several other languages are recognized as "Hindi" but do not refer to the Standard Hindi language described here and instead descend from other dialects of Hindustani, such as Awadhi and Bhojpuri; such languages include Fiji Hindi, official in Fiji, Caribbean Hindustani, a recognized language in Trinidad and Tobago and Suriname. Apart from specialized vocabulary, spoken Hindi is mutually intelligible with Urdu, another recognized register of Hindustani; as a linguistic variety, Hindi is the fourth most-spoken first language in the world, after Mandarin and English.
Alongside Urdu as Hindustani, it is the third most-spoken language in the world, after Mandarin and English. The term Hindī was used to refer to inhabitants of the region east of the Indus, it was borrowed from Classical Persian Hindī, meaning "Indian", from the proper noun Hind "India". The name Hindavī was used by Amir Khusrow in his poetry. Like other Indo-Aryan languages, Hindi is a direct descendant of an early form of Vedic Sanskrit, through Sauraseni Prakrit and Śauraseni Apabhraṃśa, which emerged in the 7th century A. D. Modern Standard Hindi is based on the Khariboli dialect, the vernacular of Delhi and the surrounding region, which came to replace earlier prestige dialects such as Awadhi and Braj. Urdu – another form of Hindustani – acquired linguistic prestige in the Mughal period, underwent significant Persian influence. Modern Hindi and its literary tradition evolved towards the end of the 18th century. However, modern Hindi's earlier literary stages before standardization can be traced to the 16th century.
In the late 19th century, a movement to further develop Hindi as a standardised form of Hindustani separate from Urdu took form. In 1881, Bihar accepted Hindi as its sole official language, replacing Urdu, thus became the first state of India to adopt Hindi. Modern Standard Hindi is one of the youngest Indian languages in this regard. After independence, the government of India instituted the following conventions: standardisation of grammar: In 1954, the Government of India set up a committee to prepare a grammar of Hindi. Standardisation of the orthography, using the Devanagari script, by the Central Hindi Directorate of the Ministry of Education and Culture to bring about uniformity in writing, to improve the shape of some Devanagari characters, introducing diacritics to express sounds from other languages. On 14 September 1949, the Constituent Assembly of India adopted Hindi written in the Devanagari script as the official language of the Republic of India replacing Urdu's previous usage in British India.
To this end, several stalwarts rallied and lobbied pan-India in favor of Hindi, most notably Beohar Rajendra Simha along with Hazari Prasad Dwivedi, Kaka Kalelkar, Maithili Sharan Gupt and Seth Govind Das who debated in Parliament on this issue. As such, on the 50th birthday of Beohar Rajendra Simha on 14 September 1949, the efforts came to fruition following the adoption of Hindi as the official language. Now, it is celebrated as Hindi Day. In Northeast India a pidgin known as Haflong Hindi has developed as a lingua franca for various tribes in Assam that speak other languages natively. In Arunachal Pradesh, Hindi emerged as a lingua franca among locals who speak over 50 dialects natively. Part XVII of the Indian Constitution deals with the official language of the Indian Commonwealth. Under Article 343, the official languages of the Union has been prescribed, which includes Hindi in Devanagari script and English: The official language of the Union shall be Hindi in Devanagari script; the form of numerals to be used for the official purposes of the Union shall be the international form of Indian numerals.
Notwithstanding anything in clause, for a period of fifteen years from the commencement of this Constitution, the English language shall continue to be used for all the official purposes of the Union for which it was being used before such commencement: Provided that the President may, during the said period, by order authorize the use of the Hindi language in addition to the English language and of the Devanagari form of numerals in addition to the international form of Indian numerals for any of the official purposes of the Union. Article 351 of the Indian constitution states It shall be the duty of the Union to promote the spread of the Hindi language, to develop it so that it may serve as a medium of expression for all the elements of the composite culture of India and to secure its enrichment by assimilating without interfering with its genius, the forms and expressions used in Hindustani and in the other languages of India specified in the Eighth Schedule, by drawing, wherever necessary or desirable, for its vocabulary on Sanskrit and secondarily on other languages.
It was envisioned that Hindi would become the sole working language of the Union Government by 1965 (per directi