Question

candle wax and petrol both produce some gases on heating,then why is petrol a better fuel than wax

Answer 1

Petrol has high ignition temperature and also high calorific value due to which it is considered as a better fuel than the wax.

(Ignition temperature is the measure of the minimum temperature at which the substance ignites without the presence of an external flame.

Calorific value means the energy contained in the fuel which is determined by measuring the amount of heat released by a unit weight or unit volume of a substance on complete combustion.)