The noun "heat" can be both countable and uncountable.
Meaning: the quality of being hot
Example sentence: He couldn't stand the heat, so he got out of the sauna.
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.
Test your understanding:
- As we waited for the start of our heat, we felt the sun's rays on our backs.
- As we waited on the starting line, we felt the heat of the sun on our backs.