The substance which undergoes combustion is called combustible substance
In simple words-
Substance which can burn in air is called combustible substance
LPG, Kerosene are fuels
LPG is a liquid fuel used in home for burning
Different Solid, Liquid and Gaseous Fuels
All fuels produce heat on burning, but how do we choose which one is better?
Some fuels burn more heat than other fuels. It is found by Calorific Value of Fuel