Question

i will mark brainliest
what is fuel

Answer 1

the substance which produce heat on burning is called fuel

Answer 2

Substances that are burned to produce heat are called fuels. These fuels are used for various purposes at home, in industries, and for running automobiles. Coal, petrol, diesel, wood, charcoal, etc are some example of commonly used fuels.

1. ​The proportion of energy released by a fuel during combustion process which is converted into useful work is called as its fuel efficiency.

2. Highest fuel efficiency is of hydrogen gas and lowest fuel efficiency is of coal.