The ratio of the amount of water in the air to the amount of water in saturated air is called

• A. Dew Point
• B. Relative Humidity
• C. Hail
• D. Snow

Answer: (B)

Relative humidity describes how much water vapor is in the air compared with how much water vapor the air could hold at the current temperature. It’s the ratio of the actual amount of water vapor to the saturation amount, typically expressed as a percentage. When air is holding as much vapor as possible, the relative humidity is 100%. The dew point is a temperature at which condensation begins, not a ratio, and hail or snow are forms of precipitation, not measures of humidity.