Relative humidity is a measure of ________.
a. how much water vapor is in the air
b. the ratio of water vapor in air to the amount of air
c. the amount of water vapor in the air compared to some standard amount of water vapor
d. the ratio of the water vapor in the air to the amount of water vapor that it would take to saturate the air
e.None of these
Answer is d. the ratio of the water vapor in the air to the amount of water vapor that it would take to saturate the air.
Rationale: Relative Humidity indicates how moist the air is. Relative humidity is also approximately the ratio of the actual to the saturation vapor pressure in other words it is a ratio of the air's actual water-vapor content compared with the amount of water vapor air can hold at that temperature and pressure.
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