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In page Humidity:

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Specific humidity (or moisture content) is the ratio of the mass of water vapor to the total mass of the air parcel.[1] Specific humidity is approximately equal to the mixing ratio, which is defined as the ratio of the mass of water vapor in an air parcel to the mass of dry air for the same parcel. It is typically represented with the symbol ω, and is commonly used in HVAC system design.[citation needed]