D. All of these.
The following could cause the relative humidity of an air mass to change;
a change in its pressure
a change in its water vapor content
a change in its temperature
Step-by-step explanation:
An increase in temperatures of an air mass means that it can acommodate more moisture. Therefore, if it retains its initial moisture content, its relative humidity will have lowered.
If an air mass gets more moisture content at its temperature, its relative humidity increases.
When the pressure of an air mass is increased (while holding its initial moisture content), its relative humidity increases because with increased pressure there’s a decrease in the moisture content it can accommodate.
The probable question can be: An air mass's relative humidity is a measure of how much water vapor it contains compared to how much it can contain Different
types of air masses, with different temperatures and pressures, are able to hold different amounts of water vapor
Which of the following could cause the relative humidity of an air mass to change?
A. a change in its pressure
B. a change in its water vapor content
c. a change in its temperature
D. all of these