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Title: Fundamentals Of Moisture Determination
Author: W. m. Moore
Source: 1975 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1975
Abstract: One of the fundamental methods of measuring the water content of gaseous fluids is to observe the evaporation of water into the gas. The rate of evaporation being measured by the temperature depression is caused by the absorption of water. The application of natural laws governing such phenomena produces a measure of water vapor pressure that is relative to the vapor pressure when saturated. Hence, the term relative humidity and the measured quantity Is always in percent of total saturation. This method is utilized in atmospheric studies and other low pressure, high relative humidity conditions. The instruments using this method are primarily spot samplers, and continuous recorders are not frequently used. They are called hygrometers or psychometers.

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