2. Parameters

Moisture/Humidity » Saturation Mixing Ratio (ws) Definition

Definition: Saturation Mixing Ratio

The saturation mixing ratio (ws) is the ratio of the mass of water vapor (Mv) to the mass of dry air (Md) in a parcel of air at saturation. In other words ws is the maximum amount of water vapor that a parcel can hold without condensation.

ws = Mv / Md

The saturation mixing ratio is expressed in parts per thousand, usually grams of water vapor per kilogram of dry air.