The noun "fuel" can be both countable and uncountable.
Meaning: something that's burned for heat or power, like wood, oil, gas, etc.
Example sentence: Mum thinks her car's broken down, but it's just run out of fuel.
Meaning: a particular kind of fuel
Example sentence: One day we'll run out of fossil fuels like oil, coal and natural gas.
Test your understanding:
- Mario says food is just fuel for the body.
- Most of the fuels we use now are unrenewable.