Question

The capacity of the air to hold water vapour:
A. Increases as the temperature increases
B. Decreases as the temperature increases
C. Increases as the temperature decreases
D. Decreases as the temperature decreases

Answer 1

Hint:
> Air is said to be saturated at 100 percent relative humidity when it contains the highest possible amount of humidity at that particular temperature.
> Warmer air will carry more water vapour inside.
> A given volume of air at 20°C can carry twice as much water vapour as 10°C.

Complete answer:
The water keeping capacity of the air depends heavily on the temperature of the air (i.e. the warmer the air is, the more water it can hold). At a given temperature, the air is saturated when it reaches the maximum water-holding power, also known as the dew point.

Relative humidity (RH) is the ratio of how much water vapour there is in the air and how much moisture the air will retain when it is saturated, while the vapour pressure deficit (VPD) is the difference between the two.

The water-vapour content of the atmosphere varies from place to place and from time to time because the humidity-holding capacity of the air is determined by the temperature. For example, a volume of air at 30 °C can contain up to 4 per cent of water vapour. At-40 °C, however, it cannot carry more than 0.2 per cent. The higher the temperature, the greater the water holding capacity.

When air temperatures rise, the ability of the air to retain moisture increases. At 80 degrees F, the air capacity rises to where it can hold 21,537 g/kg of water vapour.

The given options are as follows.

The capacity of the air to hold water vapour increases as the temperature increases. Thus, option A is the right answer.

The capacity of the air to hold water vapour does not decrease as the temperature increases. Thus, Option B is not the right answer.

The capacity of the air to hold water vapour Increases but the temperature does not decrease. Hence, Option C is also an incorrect option.

The capacity of the air to hold water vapour does not decrease as the temperature decreases. Thus, Option D is also not the right alternative.

Therefore, the correct answer is A

Note:
> Spring is the season with the driest weather.
> The weather is becoming moister and moister throughout the growing season and in the fall.
> Relative humidity of 100 per cent is usually equal to rain or fog episodes.