Relative humidity and specific humidity are both measured as percentages.

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Relative humidity is measured as a percentage, indicating the amount of moisture in the air compared to the maximum it can hold at that temperature. Specific humidity, however, is measured as a ratio of the mass of water vapor to the total mass of the air parcel, typically expressed in grams of water vapor per kilogram of air (g/kg), not as a percentage.

Relative Humidity and Specific Humidity Are Both Measured as Percentages