The correct answer is: D. Specific humidity
Specific humidity is the ratio of the mass of water vapor to the mass of dry air in a parcel of air. It is often expressed as a percentage.
Absolute humidity is the mass of water vapor per unit volume of air. It is often expressed in grams per cubic meter.
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 often expressed as a percentage.
Mixing ratio is the ratio of the mass of water vapor to the mass of dry air in a parcel of air, multiplied by 1000. It is often expressed in grams per kilogram.
Saturation vapor pressure is the pressure exerted by water vapor in a
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