Answer the following question given this paragraph: 

A: Humidity is a measure of the amount of water vapor in the air. When humidity is high, sweat evaporates more slowly because there is already a lot of water vapor in the air. The slower evaporation rate reduces the potential for evaporative cooling.


Q: What is the measurement for the amount of water vapor in the air?

 Choices:

- haze

- ambient

- saturation

- humidity

A:
humidity
