Understanding Relative Humidity

What does Relative Humidity (RH) measure?

• The amount of water vapor in the air compared to the maximum it can hold

• The temperature of the air

• The pressure of the air

• The wind speed.

Relative Humidity is expressed as a ______.

• fraction

• percentage

• decimal

• ratio

If the air is holding half the water vapor it can at a specific temperature, what is the relative humidity?

• 25%

• 50%

• 75%

• 100%

According to the graph, which range of relative humidity has the highest frequency?

• 26-35%

• 36-45%

• 66-75%

• >80%

What is the frequency of the 46-55% relative humidity range according to the graph?

• 5

• 10

• 15

• 20

Fill in the blank: If the air is holding all the water vapor it can at a specific temperature, the relative humidity is ______.

• 0%

• 50%

• 100%

• 150%

Which of the following is NOT a range shown in the relative humidity distribution graph?

• 26-35%

• 36-45%

• 56-65%

• 81-90%

True or False: Relative Humidity can be more than 100%.

• True

• False

What does a relative humidity of 0% mean?

• The air is completely dry

• The air is fully saturated

• The air is at maximum temperature

• The air is at maximum pressure.

In the graph, which range has the lowest frequency?

• 26-35%

• 36-45%

• 56-65%

• 76-80%