The correct answer is: A. Absolute humidity.
Absolute humidity is the mass of water vapor per unit volume of air. It is often expressed in grams per cubic meter (g/m3) or kilograms per cubic meter (kg/m3).
Mixing ratio is the mass of water vapor per unit mass of dry air. It is often expressed in grams per kilogram (g/kg) or kilograms per kilogram (kg/kg).
Relative humidity is the ratio of the amount of water vapor in the air to the amount of water vapor that the air could hold at the same temperature and pressure. It is
75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube