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Relative humidity has multiple answers. The one that makes most sense is "How much water vapor can a solution hold above a salt solution compared to a pure water system at saturation pressure or temperature?" This is really a function of the partial pressure of water above a salt solution compared to the pure component vapor pressure of water at T and P.

So Relative Humidity

Where is the partial pressure of water above the salt solution and is the vapor pressure of water at T and P.

It turns out that this ratio is also a definition of the activity of water:

We already calculate the activity of water and report it in the output. Thus if the water activity is 0.95 then we have a relative humidity of 95%.

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