Which refers to the measure of the amount of water vapor in the air?

condensation

dew

humidity

sleet

Answer: humidity

Explanation:

The humidity refers to the amount of water vapor present in the air. The water vapor content of the air can be measured by using a device that is called as hygrometer. The water vapor remain in the gas form. The water vapors are added to the air by the process of evaporation. The increase in temperature of air results in the increase in the accumulation of water vapors hence, increases the humidity.

It's is number 3 humidity