Question

Define Fuel. Give examples of solid,liquid and gaseous fuels.

Answer 1

a fuel is a substance that can be used to produce heat at reasonable cost .
example of solid fuel: wood , charcoal, peat, and coal etc.
eamples of liquid fuel: bio diesel, hydrogen fuel, and ethanol.
examples of gaseous fuels: methane, propane, and hydrogen etc..

Answer 2

fuel is a substance used to produce heat.
ex: solid fuel - coal
liquid fuel - petrol
gaseous fuel- biogas