Weegy: The barometer is a device that's used to measure AIR PRESSURE.
User: What does it mean if the relative humidity of air is 25 percent?
A. If the water vapor content of the air increases 25 percent, it will be at the dew point.
B. The water vapor in the air is in the lower 25 percent of the atmosphere.
C. Twenty-five percent of the air is composed of water vapor.
D. The air is holding only 25 percent of the water vapor it can hold at that temperature.
Weegy: Relative humidity of 25% means: Twenty-five percent of the air is composed of water vapor.
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