Comparison of different forms of fuel

Coal and Petroleum of Class 8

COMPARISON OF DIFFERENT FORMS OF FUEL

Solid fuels

Liquid fuels

Gaseous fuels

Combustible substances which are solid at room temperature are known as solid fuel.

Volatile liquids which produce combustible vapours are known as liquid fuels.

Combustible gas or mixture of combustible gases is known as gaseous fuel.

leaves a lot of residue on burning

No residue

No residue is left after burning.

Low calorific value.

Higher calorific value.

higher calorific value than liquid and solid fuels.

high ignition temperature.

low ignification

temperature

have low ignition temperature

burn with smoke

produce little or no smoke.

No smoke

Solid fuels are cheap

Liquid fuels are costly

gaseous fuels are costly

Examples

wood, coal, charcoal etc.

Examples

petrol, kerosene, diesel etc.

Examples

CNG, LPG, biogas, coal gas, water gas, producer gas and hydrogen gas.

HARMFUL EFFECTS OF BURNING OF FUELS:

  • Unburnt carbon particles in air are dangerous pollutants causing respiratory problems.

  • Incomplete combustion of a fuel gives poisonous carbon monoxide gas.

  • Increased percentage of carbon dioxide in air has been linked to global warming.

  • Oxides of sulphur and nitrogen produced by the burning of coal, diesel and petrol cause acid rain which is harmful for crops, building and soil.

fuel revision

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