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Question

n the application section of the Work File you were given the following situation:

You have measured the temperature of the air in a room and have found it to be 75 degrees F with 80% relative humidity.

**If the amount of water vapor that was contained in the air at that time does not change, but the temperature is decreased over time.

Which of the following would we expect this situation?

The relative humidity reading in the room will not change.

The relative humidity readings will increase as the temperature in the room get colder.

The relative humidity reading in the room will decrease as the temperatures gets colder.

POINT VALUE: 1.0 points

Answer 1

The relative humidity readings will increase as the temperature in the room get colder.

Dewpoint measure the amount of moisture in the air.  The temperature dictates how much moisture the air theoretically could hold.  If dewpoint=temperature, the RH is 100%.  So as temperature decreases, and moisture (dewpoint) is contant, RH will increase.