Pressure vs Temperature Diagram

Humidity

  1. Humidity is water vapour present in an air mass. There are four generally accepted expressions of humidity used in the water damage restoration industry;
    1. Humidity Ratio (HR)
    2. Relative Humidity (RH)
    3. Water Vapour Pressure (WVP)
    4. Specific Humidity (SH)

    The most common expression is ‘relative humidity’; relative humidity is the amount of moisture contained in a sample of air as compared tp the maximum amount the sample of contain at that temperature. This definition is accurate in concept; but strictly speaking, relative humidity is the ratio of the partial pressure of water in a sample of air to the water vapour pressure at saturation of that air at a given temperature and atmospheric pressure.

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