Read the following sentences carefully, and choose the incorrect one:
(a) If the humidity is an area is generally high, the climate there is said to be humid.
(b) If the amount of water vapor in the air is low, we say the humidity is low.
(c) A humidity of hundred percent at a particular temperature means that the air is holding the maximum amount of water vapor for that temperature.
(d) Rainfall is measured by an instrument called rain falling gauge"."

Correct Answer: (d) Rainfall is measured by an instrument called "rain falling gauge".

Explanation:

 Rainfall is measured by an instrument called a rain gauge, not a "rain falling gauge".

Humidity is the measure of the amount of water vapor present in the air. Water vapor is the gaseous state of water and is invisible to the human eye. Humidity indicates the likelihood for precipitation, dew, or fog to be present in a given area.

Relative humidity refers to the water vapor present in the air. It gives us how much vapor is in the air compared to the actual amount that must be present at that temperature.

For example, relative humidity of 20 percent means that the air is holding one-fifth of the water vapor it can actually hold at that temperature.