1.
Steam
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Steam is water in the gas phase, which is formed when water boils. Steam is invisible, however, steam often refers to wet steam, at lower pressures, such as in the upper atmosphere or at the top of high mountains, water boils at a lower temperature than the nominal 100 °C at standard pressure. If heated further it becomes superheated steam, piston type steam engines played a central role to the Industrial Revolution and modern steam turbines are used to generate more than 80% of the worlds electricity. If liquid water comes in contact with a hot surface or depressurizes quickly below its vapor pressure. Steam explosions have been responsible for many accidents, and may also have been responsible for much of the damage to the plant in the Chernobyl disaster. Steam is traditionally created by heating a boiler via burning coal and other fuels, water vapor that includes water droplets is described as wet steam. As wet steam is heated further, the droplets evaporate, and at a high temperature all of the water evaporates. Superheated steam is steam at a higher than its boiling point for the pressure. Steam tables contain thermodynamic data for water/steam and are used by engineers and scientists in design. Additionally, thermodynamic phase diagrams for water/steam, such as a diagram or a Mollier diagram shown in this article. Steam charts are used for analysing thermodynamic cycles. In agriculture, steam is used for sterilization to avoid the use of harmful chemical agents. Steams capacity to transfer heat is used in the home, for cooking vegetables, steam cleaning of fabric, carpets and flooring. In each case, water is heated in a boiler, steam is also used in ironing clothes to add enough humidity with the heat to take wrinkles out and put intentional creases into the clothing. About 90% of all electricity is generated using steam as the working fluid, in electric generation, steam is typically condensed at the end of its expansion cycle, and returned to the boiler for re-use. However, in cogeneration, steam is piped into buildings through a heating system to provide heat energy after its use in the electric generation cycle. The worlds biggest steam generation system is the New York City steam system, in other industrial applications steam is used for energy storage, which is introduced and extracted by heat transfer, usually through pipes. Steam is a reservoir for thermal energy because of waters high heat of vaporization
2.
Boiler
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A boiler is a closed vessel in which water or other fluid is heated. The fluid does not necessarily boil, the heated or vaporized fluid exits the boiler for use in various processes or heating applications, including water heating, central heating, boiler-based power generation, cooking, and sanitation. The pressure vessel of a boiler is usually made of steel, stainless steel, especially of the austenitic types, is not used in wetted parts of boilers due to corrosion and stress corrosion cracking. In live steam models, copper or brass is used because it is more easily fabricated in smaller size boilers. For much of the Victorian age of steam, the material used for boilermaking was the highest grade of wrought iron. In the 20th century, design practice instead moved towards the use of steel, which is stronger and cheaper, with welded construction, which is quicker and requires less labour. It should be noted, however, that wrought iron boilers corrode far slower than their steel counterparts. This makes the longevity of older wrought-iron boilers far superior to those of welded steel boilers, cast iron may be used for the heating vessel of domestic water heaters. Although such heaters are usually termed boilers in some countries, their purpose is usually to produce hot water, not steam, the brittleness of cast iron makes it impractical for high-pressure steam boilers. The source of heat for a boiler is combustion of any of several fuels, such as wood, coal, oil, electric steam boilers use resistance- or immersion-type heating elements. Nuclear fission is used as a heat source for generating steam, either directly or, in most cases. Heat recovery steam generators use the heat rejected from other such as gas turbine. 18th century Haycock boilers generally produced and stored large volumes of very low-pressure steam and these could burn wood or most often, coal. Flued boiler with one or two large flues—an early type or forerunner of fire-tube boiler, fire-tube boiler, Here, water partially fills a boiler barrel with a small volume left above to accommodate the steam. This is the type of boiler used in nearly all steam locomotives, the heat source is inside a furnace or firebox that has to be kept permanently surrounded by the water in order to maintain the temperature of the heating surface below the boiling point. Fire-tube boilers usually have a low rate of steam production. Fire-tube boilers mostly burn solid fuels, but are adaptable to those of the liquid or gas variety. Water-tube boiler, In this type, tubes filled with water are arranged inside a furnace in a number of possible configurations and this type generally gives high steam production rates, but less storage capacity than the above
3.
Replica
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A replica is an exact reproduction, such as of a painting, as it was executed by the original artist or a copy or reproduction, especially one on a scale smaller than the original. A replica is a copying closely resembling the original concerning its shape, an inverted replica complements the original by filling its gaps. It can be a used for historical purposes, such as being placed in a museum. Not all incorrectly attributed items are intentional forgeries, in the same way that a museum shop might sell a print of a painting or a replica of a vase, copies of statues, paintings, and other precious artifacts have been popular through the ages. In arts or collectible automobiles, the replica is used for discussing the non-original recreation. In motor racing, especially motorcycling, often manufacturers will produce a street version product with the colours of the vehicle or clothing of a famous racer. This is not the vehicle or clothing worn during the race by the racer. These high-performance race-look products termed Replica, are priced higher and are usually more sought-after than plain colours of the same product, because of gun ownership restrictions in some locales, gun collectors create non-functional legal replicas of illegal firearms. Such replicas are also preferred to real firearms when used as a prop in a film or stage performance, a prop replica is an authentic-looking duplicate of a prop from a video game, movie or television show. Replicas represent a copy or forgery of another object and we think of forgeries we think of paintings but, in fact, anything that is collectible. Replicas have been made by people to preserve a link to the past. This can be linked to a historical past or specific time-period or just to commemorate an experience, replicas and reproductions of artifacts help provide a material representation of the past for the public. Replicas of artifacts and art have a purpose within museums and research and they are created to help with preserving of original artifacts. Replicas and their original representation can be seen as fake or real depending on the viewer, good replicas take much education related to understanding all the processes and history that go behind the culture and the original creation. To create a good and authentic replica of an object, there is to be a skilled artisan or forger to create the authentic experience that the original object provides. This process takes time and much money to be done correctly for museum standards. Authenticity or real feeling presented by an object can be “described as the experience of an ‘aura’ of an original. ”An aura of an object is what an object represents through its previous history and experience. Replicas work well in museum settings because they have the ability to look so real, through the context and experience that a replica can provide in a museum setting, people can be fooled into seeing it as ‘original’
4.
Scale model
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This enables it to demonstrate some behavior or property of the original object without examining the original object itself. The most familiar scale models represent the appearance of an object in miniature. Scale models are used in fields including engineering, architecture, film making, military command, salesmanship. While each field may use a model for a different purpose, all scale models are based on the same principles. The detail requirements vary depending on the needs of the modeler, in general a scale model must be designed and built primarily considering similitude theory. However, other requirements concerning practical issues must also be considered, similitude is the theory and art of predicting prototype performance from scale model observations. The main requirement of similitude is all dimensionless quantities must be equal for both the model and the prototype under the conditions the modeler desires to make observations. Dimensionless quantities are generally referred to as Pi terms, or π terms, in many fields the π terms are well established. For example, in dynamics, a well known dimensionless number called the Reynolds number comes up frequently in scale model tests with fluid in motion relative to a stationary surface. An example of the Reynolds number and its use in similitude theory satisfaction can be observed in the scale model testing of fluid flow in a horizontal pipe, one method to determine the dimensionless quantities of concern for a given problem is to use dimensional analysis. Practical concerns include the cost to construct the model, available test facilities to condition and observe the model, the availability of certain materials, and even who will build it. Practical requirements are very diverse depending on the purpose of the scale model. As an example, perhaps an aerospace company needs to test a new wing shape, however, if a facility such as this one cant be used, perhaps due to cost constraints, the similitude requirements must be relaxed or the test redesigned to accommodate the limitation. In this case, concessions must be made for reasons to the similitude requirements. An example of this from fluid dynamics is flow of a liquid in a horizontal pipe, possible π terms to consider in this situation are Reynolds number, Weber number, Froude number, and Mach number. For this flow configuration, however, no tension is involved. Also, compression of the fluid is not applicable, so the Mach number can be disregarded, finally, gravity is not responsible for the flow, so the Froude number can also be disregarded. This leaves the modeler with only the Reynolds number to worry about in terms of equating its values for the scale model, in general, scale models can be classified into three classes depending on the degree of similitude satisfaction they exhibit
5.
Toy
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A toy is an item that is used in play, especially one designed for such use. Playing with toys is supposed to be a means of training young children for life in society. Different materials like wood, clay, paper, and plastic are used to make toys, many items are designed to serve as toys, but goods produced for other purposes can also be used. For instance, a child may fold an ordinary piece of paper into an airplane shape. Newer forms of toys include interactive digital entertainment, some toys are produced primarily as collectors items and are intended for display only. The origin of toys is prehistoric, dolls representing infants, animals, the origin of the word toy is unknown, but it is believed that it was first used in the 14th century. Toys are mainly made for children, the oldest known doll toy that has been found is thought to be 4,000 years old. Playing with toys is considered to be important when it comes to growing up, younger children use toys to discover their identity, help their bodies grow strong, learn cause and effect, explore relationships, and practice skills they will need as adults. Adults on occasion use toys to form and strengthen social bonds, teach, help in therapy, most children have been said to play with whatever they can find, such as sticks and rocks. Toys and games have been unearthed from the sites of ancient civilizations and they have been written about in some of the oldest literature. Toys excavated from the Indus valley civilization include small carts, whistles shaped like birds, the earliest toys are made from materials found in nature, such as rocks, sticks, and clay. Thousands of years ago, Egyptian children played with dolls that had wigs and movable limbs which were made from stone, pottery, in Ancient Greece and Ancient Rome, children played with dolls made of wax or terracotta, sticks, bows and arrows, and yo-yos. When Greek children, especially girls, came of age it was customary for them to sacrifice the toys of their childhood to the gods, on the eve of their wedding, young girls around fourteen would offer their dolls in a temple as a rite of passage into adulthood. The oldest known mechanical puzzle comes from Greece and appeared in the 3rd century BC. The game consisted of a divided into 14 parts. In Iran puzzle-locks were made as early as the 17th century, Toys became more widespread with the changing attitudes towards children engendered by the Enlightenment. Children began to be seen as people in and of themselves, as opposed to extensions of their household, the variety and number of toys that were manufactured during the 18th century steadily rose, John Spilsbury invented the first jigsaw puzzle in 1767 to help children learn geography. He created puzzles on eight themes - the World, Europe, Asia, Africa, America, England and Wales, the rocking horse was developed at the same time in England, especially with the wealthy as it was thought to develop childrens balance for riding real horses
6.
Cultural heritage
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Cultural heritage includes tangible culture, intangible culture, and natural heritage. Objects are a part of the study of history because they provide a concrete basis for ideas. Their preservation demonstrates a recognition of the necessity of the past, in The Past is a Foreign Country, David Lowenthal observes that preserved objects also validate memories. This unfortunately poses a danger as places and things are damaged by the hands of tourists, the required to display them. Similarly changing is the value each generation may place on the past, classical civilizations, and especially the Indian, have attributed supreme importance to the preservation of tradition. Its central idea was that institutions, scientific knowledge and technological applications need to use a heritage as a resource. Using contemporary language, we could say that ancient Indians considered, as social resources, ethics considered that what had been inherited should not be consumed, but should be handed over, possibly enriched, to successive generations. This was an imperative for all, except in the final life stage of sannyasa. What one generation considers cultural heritage may be rejected by the next generation, Cultural property includes the physical, or tangible cultural heritage, such as artworks. These are generally split into two groups of movable and immovable heritage, immovable heritage includes buildings, large industrial installations or other historic places and monuments. Moveable heritage includes books, documents, moveable artworks, machines, clothing, and other artifacts and these include objects significant to the archaeology, architecture, science or technology of a specified culture. The concept includes the ways and means of behavior in a society, and these include social values and traditions, customs and practices, aesthetic and spiritual beliefs, artistic expression, language and other aspects of human activity. The significance of artifacts can be interpreted against the backdrop of socioeconomic, political, ethnic, religious. Naturally, intangible heritage is more difficult to preserve than physical objects. These kind of heritage sites often serve as an important component in a countrys tourist industry, Heritage can also include cultural landscapes. As of 2011, there are 936 World Heritage Sites,725 cultural,183 natural, each of these sites is considered important to the international community. The underwater cultural heritage is protected by the UNESCO Convention on the Protection of the Underwater Cultural Heritage and this convention is a legal instrument helping states parties to improve the protection of their underwater cultural heritage. In additional, UNESCO has begun designating masterpieces of the Oral, international Institute for Conservation Much of heritage preservation work is done at the national, regional, or local levels of society
7.
Revenue
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In accounting, revenue is the income that a business has from its normal business activities, usually from the sale of goods and services to customers. Revenue is also referred to as sales or turnover, some companies receive revenue from interest, royalties, or other fees. Revenue may refer to income in general, or it may refer to the amount, in a monetary unit, received during a period of time, as in Last year. Profits or net income generally imply total revenue minus total expenses in a given period, in accounting, revenue is often referred to as the top line due to its position on the income statement at the very top. This is to be contrasted with the line which denotes net income. For non-profit organizations, annual revenue may be referred to as gross receipts, in general usage, revenue is income received by an organization in the form of cash or cash equivalents. Sales revenue or revenues is income received from selling goods or services over a period of time, tax revenue is income that a government receives from taxpayers. In more formal usage, revenue is a calculation or estimation of periodic income based on a standard accounting practice or the rules established by a government or government agency. Two common accounting methods, cash basis accounting and accrual basis accounting, corporations that offer shares for sale to the public are usually required by law to report revenue based on generally accepted accounting principles or International Financial Reporting Standards. In a double-entry bookkeeping system, revenue accounts are general ledger accounts that are summarized periodically under the heading Revenue or Revenues on an income statement, Revenue account names describe the type of revenue, such as Repair service revenue, Rent revenue earned or Sales. Money income from activities that are ordinary for a corporation, company, partnership. For some businesses, such as manufacturing and/or grocery, most revenue is from the sale of goods, service businesses such as law firms and barber shops receive most of their revenue from rendering services. Lending businesses such as car rentals and banks receive most of their revenue from fees, Revenues from a businesss primary activities are reported as sales, sales revenue or net sales. This includes product returns and discounts for early payment of invoices, most businesses also have revenue that is incidental to the businesss primary activities, such as interest earned on deposits in a demand account. This is included in revenue but not included in net sales, Sales revenue does not include sales tax collected by the business. Other revenue is revenue from peripheral operations, for example, a company that manufactures and sells automobiles would record the revenue from the sale of an automobile as regular revenue. The combination of all the revenue generating systems of a business is called its revenue model, Revenue is a crucial part of financial statement analysis. The company’s performance is measured to the extent to which its asset inflows compare with its asset outflows, net income is the result of this equation, but revenue typically enjoys equal attention during a standard earnings call
8.
Narrow-gauge railway
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A narrow-gauge railway is a railway with a track gauge narrower than the 1,435 mm of standard gauge railways. Most existing narrow-gauge railways are between 600 mm and 1,067 mm, narrow-gauge railways also have specialized use in mines and other environments where a very small structure gauge makes a very small loading gauge necessary. Narrow-gauge railways also have general applications. Many narrow-gauge street tramways are used, particularly in Europe, where 1,000 mm metre gauge tramways are common, the earliest recorded railway is shown in the De re metallica of 1556, which shows a mine in Bohemia with a railway of about 2 ft gauge. During the 16th century, railways were mainly restricted to hand-pushed narrow-gauge lines in mines throughout Europe, during the 17th century, mine railways were extended to provide transportation above ground. These lines were industrial, connecting mines with nearby transportation points and these railways were usually built to the same narrow gauge as the mine railways from which they developed. The worlds first steam locomotive on rails, built in 1802 by Richard Trevithick for the Coalbrookdale Company, during the 1820s and 1830s, a number of industrial narrow-gauge railways in the United Kingdom used steam locomotives. In 1842, the first narrow-gauge steam locomotive outside the UK was built for the 1,100 mm gauge Antwerp-Ghent Railway in Belgium, historically, many narrow-gauge railways were built as part of specific industrial enterprises and were primarily industrial railways rather than general carriers. Some common uses for these industrial narrow-gauge railways were mining, logging, construction, tunnelling, quarrying, extensive narrow-gauge networks were constructed in many parts of the world for these purposes. For example, mountain logging operations in the 19th century often used narrow-gauge railways to transport logs from mill sites to market, significant sugarcane railways still operate in Cuba, Fiji, Java, the Philippines, and Queensland. Narrow-gauge railway equipment remains in use for the construction of tunnels. Extensive narrow-gauge railway systems served the front-line trenches of both sides in World War I and they were a short-lived military application, and after the end of the war, the surplus equipment from these created a small boom in narrow gauge railway building in Europe. Narrow-gauge railways usually cost less to build because they are lighter in construction, using smaller cars and locomotives, as well as smaller bridges, smaller tunnels. Narrow gauge is often used in mountainous terrain, where the savings in civil engineering work can be substantial. It is also used in populated areas where the potential demand is too low for broader gauge railways to be economically viable. This is the case in some of Australia and most of Southern Africa, the use of such railways has almost vanished due to the capabilities of modern trucks. In many countries, narrow gauge railways were built as feeder or branch lines to feed traffic to more important standard gauge lines, the choice was often not between a narrow-gauge railway and a standard gauge one, but between a narrow-gauge railway and none at all. Some bulk commodities, such as coal, ore, and gravel, can be transshipped, but this still incurs time penalties
