Question

The weight of water vapour per unit weight of air is called?
A. Specific Humidity
B. Relative Humidity
C. Absolute Humidity
D. None of the above

Answer 1

Hint: This is an incredibly valuable quantity for meteorology. This should not vary as the temperature or pressure of the body affects the air, as long as the moisture is not applied to or extracted from the body. This stability makes it useful to define the properties of the moving air mass.

Complete Answer:
Specific humidity is typically expressed as a gramme of vapour per kilogramme of air. The rate of evaporation of water from any surface is directly proportional to the specific humidity, the difference between the surface and the adjacent air. It's an incredibly valuable quantity in meteorology. Neither with temperature or pressure does specific humidity vary.

The specific humidity of saturated air increases rapidly with rising temperatures. Specific humidity is an extremely useful quantity in meteorology, and this can be illustrated by an example. Between the surface and the adjacent air, the rate of evaporation of water from any surface must be understood as directly proportional to the precise difference in humidity.

The following are the options that are given:
- The weight of the water vapour per unit weight of the air is called specific humidity. Thus, option A is the correct one.
- Relative humidity (RH) is the ratio of the partial pressure of the water vapour to the equilibrium vapour pressure of the water at the stated temperature. Option B is an incorrect alternative.
- Absolute humidity is the measurement of water vapour (moisture) in the air, independent of temperature. Thus, option C is also an incorrect option.

Therefore, Choice A is the correct answer.

Note: The basic humidity unit is the most accurate humidity measurement unit. Specific humidity is typically expressed as "Grains per lb" in IP units. Dry air" or "lbs. The basic moisture content is approximately equal to the mixing ratio.