That’s a good question. Humidity is the amount of water vapor present in the air There are different ways to measure humidity, but the most common one is relative humidity, which is expressed as a percentage.

Relative humidity indicates how much water vapor the air is holding compared to how much it can hold at a given temperature. The higher the temperature, the more water vapor the air can hold.

At 100% relative humidity, the air is saturated and is at its dew point This means that the air cannot hold any more water vapor and any additional moisture will condense into liquid water This does not mean that the air has become water, but rather that it is very moist and prone to fog, dew, or precipitation.

It is possible for the relative humidity to exceed 100%, in which case the air is said to be supersaturated This happens when there are no surfaces or particles for the excess water vapor to condense on, and the air becomes unstable This condition is rare and usually short-lived, as any disturbance can trigger condensation and cloud formation.
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