Name:__________________________________ Period:_________
Relative Humidity Problems
Date:_______________
Use the Water Vapor Capacity chart with these problems. Don’t forget to use the correct units in your answer!
1.
What is the water vapor capacity of air at each of the following temperatures?
-3 ⁰C
10⁰C
26⁰C
33⁰C
2.
How does the water vapor capacity of air change with increasing temperature?
Relative humidity is a very common measurement used to describe how much water vapor is in the air. It tells you how close the air is to reaching its water vapor capacity. It is the ratio between the absolute humidity (the actual amount in the air) to the water vapor capacity. It is expressed as a percent.
Relative Humidity (%) = (Absolute Humidity ÷ Water Vapor Capacity) * 100%
3.
If the air is actually holding all that it can at a given temperature then the air is saturated or at 100% humidity.
How much water vapor would have to be in the air when the temperature was 11⁰C to have 100% humidity?
4.
Determine the relative humidity for each of the following situations of identical temperature.
Air
Temperature
15⁰C
Absolute Humidity Water Vapor Capacity Relative Humidity
15⁰C
15⁰C
2 g/kg
5 g/kg
7g/kg
5.
If the temperature of the air remains constant, adding water vapor will (raise, lower) the relative humidity, while removing water vapor will (raise, lower) the relative humidity. Circle your answers.
6.
Determine the relative humidity for each of the following situations of identical absolute humidity.
Air Temperature
25⁰C
15⁰C
5⁰C
Absolute Humidity
5 g/kg
5 g/kg
5 g/kg
Water Vapor Capacity Relative Humidity
7.
If the amount of water vapor in the air remains constant, cooling the air will (raise, lower) the relative humidity, while warming the air will (raise, lower) the relative humidity. Circle your answers.

Name:__________________________________ Period:_________ Date:_______________
8.
If the temperature is 32⁰C and the absolute humidity is 28.2 g/kg, what is the relative humidity?
9.
If the temperature is 7⁰C and the absolute humidity is 4.5 g/kg, what is the relative humidity?
10.
If the air temperature is 17⁰C and it contains 10 g/kg of water vapor, what is the relative humidity?
11.
If the air temperature is 27⁰C and it contains 13.2 g/kg of water vapor, what is the relative humidity?
12.
If the air in a room is 29⁰C and the relative humidity is 60%, what is the absolute humidity?
13.
If the air in a room is 19⁰C and the relative humidity is 25%, what is the absolute humidity?
14.
An air mass has an absolute humidity of 5g/kg. What is the relative humidity if the air temperature is 4⁰C?
15.
An air mass has an absolute humidity of 4.3 g/kg. What is the relative humidity if the air temperature is 5⁰C?