What Is Coal?

Coal is an impure form of carbon that formed from the remains of prehistoric plants. Coal burns very easily, releasing large amounts of heat. Coal, like oil and gas, is a fossil fuel. While oil and gas formed from the remain of living organisms, coal formed from the remain of decaying plants from prehistoric forests. These remains were compressed and changed by the layers of rock above them.

There are three main type of coals, each containing a different amount of carbon, bituminous coal and lignite. Anthracite which is carbon are the most valuable form of coal because it contain 95% of carbon. Other like Bituminous coal and lignite only have 70% and 50% carbon in it. Most of the coal found in underground bands or seams.

Coal was the main fuel for the Industrial Revolution at the end of 18th century. It powered steam engines and was used for making iron and steel. Today, most coal is burned in power station to generate electricity. Coal-fired power station use filters and other devices to trap soot and other pollution formed when the coal are burns.

When coal is heated in a chamber called a retort, it release gas, oil and tar. The gas can be burned as fuel. The oil and tar contain chemicals that can be used for making products such as dyes, perfumes and artificial fibers. The solid that left behind in the retort is coke. It is used as a smokeless fuel and for making iron. This is what the Coal are.