Environmental Science
When the air temperature is below freezing, the saturation vapour pressure over water is .

Less than the saturation vapour pressure over ice
Greater than the saturation vapour pressure over ice
Equal to the saturation vapour pressure over ice
Equal to zero

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Environmental Science
Which of the following statements is not correct?

The relative humidity is a measure of the air's actual water vapor content.
A change in the air temperature can change the relative humidity.
During the winter, low relative humidity can irritate the mucus membranes in the nose and throat.
The length of human hair changes as the relative humidity changes.

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