Question

Describe the different forms of coal??

Answer 1

hey mate here's ur ans:

Coal is a fossil fuel which is formed by the decomposition and degradation of plant, vegetation and animal life over a period of million of years under the pressure of earth. The energy which we get after burning of these fossil fuels is the same energy that was absorbed by them from the sun.

There are many types of coal, including anthracite, bituminous, subbituminous, and lignite.

Anthracite is the highest ranked, hardest, oldest, and least common type of coal. It possesses a high energy content, high percentage of carbon (>85%) and relatively little moisture or volatiles. Anthracite produces nearly 15,000 Btu's per pound.

Bituminous is the second rank of coal, softer and younger than anthracite, and containing a lower percentage of carbon (45-85%) and therefore more moisture and volatiles. Bituminous coal is primarily used to generate electricity and to make coke for the steel industry. It has a heat value of 10,500 to 15,500 Btu's per pound. Subbituminous coal ranks just below bituminous coal with 35 to 45 percent carbon content. The heat value of subbituminous coal is between 8,300 and 13,000 Btu's per pound.

Lignite has the softest, youngest, and wettest rank of coal with a carbon content of only 25-35%. The heat value of lignite ranges between 4,000 and 8,300 Btu's per pound. Sometimes lignite is known as brown coal because of its brown color.

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Franky, works at Self-Employment (2016-present)

Answered Apr 30, 2018 · Author has 135answers and 79.3k answer views

There are four different types of coal. Rank alludes to ventures in a moderate, regular process called "coalification," during which covered plant matter changes into an ever denser, drier, more carbon rich, and harder material. The four positions are:



Anthracite: The most astounding rank of coal. It is a hard, weak, and dark brilliant coal, frequently alluded to as hard coal, containing a high level of settled carbon and a low level of unpredictable issue.

Bituminous: Bituminous coal is a center rank coal amongst subbituminous and anthracite. Bituminous more often than not has a high warming (Btu) esteem and is the most widely recognized sort of coal utilized as a part of power age in the United States. Bituminous coal seems sparkly and smooth when you first observe it, however look closer and you may see it has layers.

Subbituminous: Subbituminous coal is dark in shading and dull (not gleaming), and has a higher warming an incentive than lignite.

Lignite: Lignite coal, otherwise known as darker coal, is the most reduced review coal with minimal convergence of carbon.

Answer 2

coal is black in colour and appears like a stone coal is also fossil fuel but coal is made from the remains of Dead plants breathe under the earth millions of years ago. different forms of coal are

1) peat = it contains 50% to 60% of carbon and forms a lot amount of shoot when was it is the first form of coal

2) anthracite = it has the largest amount of carbon it contains up to 90% to 96% percent of carbon that's why it is considered as the best variety of coal

3) lignite = it has about 60% carbon it is the next step of carbonization of peat

4) bituminous coal = it contains about 70% to 80% of carbon it is a common variety of coal