Answer:
The ratio of the water vapor actually present in the air to the amount if the air were saturated is called relative humidity.
Explanation:
The relative humidity allows:
- To measure the actual amount of moisture in the air at a given temperature, and compares it to the maximum amount of moisture the air can hold at the same temperature (saturation conditions of the air at the specific conditions).
- Also, is allows to give an idea of the comfort that a specific condition gives. This is, because the comfort level under a specific humidity conditions, depends more on relative humidity than in the actual humidity in the air.