How grades of coal differ has to be described and the significance of these differences has to be provided. Concept Introduction: A fuel is a substance which releases energy in the form of heat while undergoing combustion. Hydrocarbons which have high heats of combustion make it a best fuel. Coal is a good fuel becouse it is completely made up of carbon atoms. It is a fossil fuel. Coals can be classified and graded according to the carbon percent and the impurity percent such as sulfur. Anthracite coal has high carbon content.

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Chapter 4, Problem 7Q

Interpretation Introduction

Interpretation:

How grades of coal differ has to be described and the significance of these differences has to be provided.

Concept Introduction:

A fuel is a substance which releases energy in the form of heat while undergoing combustion. Hydrocarbons which have high heats of combustion make it a best fuel.

Coal is a good fuel becouse it is completely made up of carbon atoms. It is a fossil fuel.

Coals can be classified and graded according to the carbon percent and the impurity percent such as sulfur.

Anthracite coal has high carbon content.

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