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gas

The noun "gas" can be both countable and uncountable.

gas → uncountable

Meaning: any substance like air that's neither solid nor liquid

Example sentence: Did you know that a cow emits around 200 litres of gas a day by burping?

gas → countable

Meaning: a particular type of gas

Example sentence: Cows emit methane, one of the many gases that cause global warming.


Note: In American English, another uncountable meaning of "gas" is petrol, a liquid fuel for cars (derived from "gasoline").

Quick Quiz:

In which sentence is the word "gas" countable?

a. How many different gases are in the atmosphere?

b. How much gas does a sheep emit when it burps?

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Contributor: Matt Errey