Question

Distinguish between the following.

Anthracite coal and Lignite coal.

Answer 1

Sr. No.	Basis	Anthracite Coal	Lignite Coal
1.	Carbon Content	Contains the highest carbon content, typically between 80% to 95%.	Contains a much lower carbon content, typically between 40% to 55%.
2.	Moisture Content	Has extremely low moisture and volatile matter content.	Has a very high moisture content, which reduces its burning efficiency.
3.	Physical Appearance	It is hard, compact, dense, and deep black with a shiny metallic luster.	It is soft, easily crumbly (friable), and brownish-black in color (often called brown coal).
4.	Heating Value	Possesses the highest heating capacity and thermal efficiency.	Has a relatively low heating capacity and thermal efficiency.
5.	Combustion Properties	Burns slowly with a short blue flame, producing almost no smoke and very little ash.	Burns with a smoky flame and leaves behind a large amount of ash.