The psychrometric method is an indirect means of determining the moisture content of a gas or air stream. It is based on the principle that the vapor pressure of water in a gas stream is a function of the temperature and the moisture content of the gas stream.
The psychrometric method is relatively simple to use and can be used to measure the moisture content of a gas stream over a wide range of temperatures and moisture contents.
The psychrometric method is carried out by passing the gas stream through a psychrometer. A psychrometer is a device that consists of two thermometers, one of which is wetted with water. The thermometers are exposed to the gas stream and the difference in temperature between the two thermometers is measured.
The difference in temperature between the two thermometers is a function of the moisture content of the gas stream. The higher the moisture content of the gas stream, the greater the difference in temperature between the two thermometers.
The temperature difference is used to calculate the relative humidity of the gas stream. The relative humidity is a measure of the amount of water vapor in the gas stream compared to the amount of water vapor that the gas stream could hold at a given temperature. The relationship between temperature difference and relative humidity is given by the psychrometric chart.The psychrometric method is a widely used method for measuring the moisture content of a gas stream. It is relatively simple to use and can be used to measure the moisture content of a gas stream over a wide range of temperatures and moisture contents.