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This page is about the noun "heat", which can be both countable and uncountable

heat → uncountable

Meaning: the quality of being hot

Example sentence: He couldn't stand the heat, so he got out of the sauna.

heat → countable

Meaning: a qualifying race or game at the start of a competition

Example sentence: If we win all our heats, we'll get into the final match.

Quick Quiz:

In which sentence is the word "heat" countable?

a. As we waited for the start of our heat, we felt the sun's rays on our backs.

b. As we waited on the starting line, we felt the heat of the sun on our backs.

Contributor: Matt Errey