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How to Calculate Saturation Mixing Ratio

The saturation mixing ratio is defined by the variable "w" with a subscript "s." It is a measure of how much water vapor air can hold at a certain temperature and pressure. When this maximum amount of water vapor is present in air, the air is said to be saturated. In order to calculate the ratio in a practical setting, values of air temperature and vapor pressure must be available.

Instructions

    • 1

      Insert the air temperature in degrees Celsius into the following equation -- 6.11 x 10 ^ ((7.5 x T) / (237.7 + T)). Replace T with the air temperature.

    • 2

      Compute the following equation -- 621.97 x ((es) / (vp - es)). Replace "es" with the result from the previous step.

    • 3

      Replace "vp" with the vapor pressure at the location is in millibars or hectopascals. The result of the equation is the saturation mixing ratio.

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