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 the above

Question

Quizplus · Accepted Answer

Relative humidity is defined as the ratio of the amount of water vapor present in the air to the amount of water vapor that the air can hold at saturation, expressed as a percentage. Therefore, option D best defines relative humidity. Option A is incorrect because it only refers to the amount of water vapor in the air, without comparing it to the air's capacity for holding water vapor. Option B is incorrect because it assumes that there is a fixed amount of air, which is not always the case in dynamic atmospheric environments. Option C is incorrect because it does not specify what the standard amount of water vapor is.

Relative Humidity Is a Measure of ________