To register Science Tuitions on Vedantu.com to clear your doubts. Bituminous class coals of high, medium, and low volatile rank that possess these properties are called “coking” coals. (Class IIIa - aviation fuel and lubricants) Class IV - Supplies for which initial issue … The made by human efforts for our basic needs is man-made Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams.Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur, oxygen, and nitrogen. Typical Moisture Content in Coal. Class III - Petroleum, oil and lubricants (POL) for all purposes, except for operating aircraft or for use in weapons such as flamethrowers, e.g., gasoline, fuel oil, greases, coal, and coke. Coal is the largest source of energy for generating electricity in the world, and the most abundant fossil fuel in the United States. Coal is formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years. How to avoid spreading of Micro-organisms has been discussed. Answer: We use various materials for our basic needs. The lesson covers the complete explanation of class 8 Chapter 2 Microorganisms.Topics covered are Introduction to Micro-organisms and microbiology, different types of Micro-organisms, Useful and Harmful Micro-organisms. (See table 1.) Coal is a hard black coloured substance which is mainly carbonWhat are the uses of Coal?Different uses of Coal areIt is used in villages to cook foodIt is used in Thermal power plants to produce electricityIt was used in steam engines of train. Some of them are found in nature like air, water, soil and minerals are called natural resources. Coal, one of the most important primary fossil fuels, a solid carbon-rich material, usually brown or black, that most often occurs in stratified sedimentary deposits, which may later be subjected to high temperatures and pressures during mountain building, … Anthracite Coal : 80.5 - 85.7 weight % Bituminous Coal : 44.9-78.2 weight % Lignite Coal : 31.4 weight % Typical Density of Coal. Anthracite Coal : 2.8 - 16.3 weight % Bituminous Coal : 2.2 - 15.9 weight % Lignite Coal : 39 weight % Typical Fixed Carbon Content in Coal. Soft coal is also known as brown coal or lignite. Coke quality is largely influenced by coal rank, composition, mineral content and the ability to soften when heated, become plastic, and resolidify into a coherent mass. Coal and Petroleum of Class 8 ABOUT COKE Coke is a solid carbonaceous residue derived from low-ash, low sulphur bituminous coal from which the volatile constituents are driven off by baking in an oven without oxygen at temperatures as high as 1,000 °C (1,832 °F) so that the fixed carbon and residual ash are fused together. Microorganisms Class 8 Science Chapter 2 as per NCERT Book used in CBSE and other Schools. This class of coal is divisible on the basis of increasing heat value into the subbituminous C, B, and A coal groups. subbituminous coal.--A rank class of nonagglomerating coals having a heat value content of more than 8,300 Btu's and less than 11,500 Btu's on a moist, mineral-matter-free basis. Free PDF download of Class 8 Science Chapter 5 - Coal and Petroleum Revision Notes & Short Key-notes prepared by expert Science teachers from latest edition of CBSE(NCERT) books. 1 Coal and Petroleum 8 th Science study guide 8th Class Science Chapter- 05 - Coal and Petrolium Q. What are natural and manmade resources? China produces more hard coal than any other country by a factor of about three. The biggest coal deposit by volume is the Powder River Basin in Wyoming and Montana, which the USGS estimated to have 1.07 trillion short tons of in-place coal resources, 162 billion short tons of recoverable coal resources, and 25 billion short tons of economic coal resources (also called reserves) in 2013. Coal is a black or brownish-black sedimentary rock that can be burned for fuel and used to generate electricity.It is composed mostly of carbon and hydrocarbons, which contain energy that can be released through combustion (burning). The whopping 3,162 million metric tons of hard coal produced by China dwarfs the output of the second and third-ranked producers—the U.S. at 932 million metric tons and India at 538 million metric tons. 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