Consider the following statements and choose the correct one:
(a) We know that air or atmosphere always contains some water vapour or moisture in it.
(b) Humidity is a measure of water vapour or moisture in air.
(c) When the amount of water vapour in the air is high, we say humidity is high and the air feels moist or damp.
(d) All the above.

Correct Answer: (d) All the above.

Explanation:

We know that air or atmosphere always contains some water vapor or moisture in it. Humidity is a measure of water vapor or moisture in the air. When the amount of water vapor in the air is high, we say humidity is high and the air feels moist or damp.