Question

When temperature decreases but actual water vapor content remains the same, what happens to relative humidity?

Answer 1

Answer:

d. Relative humidity increases.

Explanation:

The expression of relative humidity in terms of absolute humidity, absolute pressure and saturation pression at measured temperature is:

$\phi = \frac{\omega \cdot P}{(0.622+\omega)\cdot P_{sat}}$

When temperature decreases, the saturation pressure decreases also and, consequently, relative humidity increases. Therefore, the right answer is option D.

Answer 2

Answer:

d. Relative humidity increases

Explanation:

Relative humidity is defined as the amount of water vapor which can be found in air.

When temperature decreases and the actual water vapor content remains the same the relative humidity increases.

When the temperature increases and the actual water vapor content remains the same the relative humidity decreases.

This is because air at a higher temperature needs more moisture for it to get saturated than air with a lower temperature.