Principle of hygrometer

Best answer: Because the temperature sensor of wet bubble thermometer is wrapped with cotton yarn, and the lower end of cotton yarn is immersed in water, the temperature indication of wet bubble thermometer is always lower than that of dry bubble thermometer (air temperature), which is related to the evaporation speed of water (that is, the relative humidity at that time). According to the readings of two thermometers, the relative humidity of 空 gas can be found from the table or curve.

Because the temperature sensor of wet bubble thermometer is wrapped with cotton yarn, and the lower end of cotton yarn is immersed in water, the temperature indication of wet bubble thermometer is always lower than that of dry bubble thermometer (air temperature) due to the evaporation of water (i.e. relative humidity at that time). According to the readings of two thermometers, the relative humidity of 空 gas can be found from the table or curve.

Physical property analyzer for measuring gas humidity. Humidity indicates the water vapor content in the gas, which can be expressed in two ways: absolute humidity and relative humidity. Absolute humidity refers to the absolute content of water vapor in gas, and the most commonly used unit is g/m 3. At a certain temperature and pressure, the water vapor content per unit volume has a certain limit, which is called saturated water vapor content. Relative humidity refers to the ratio of absolute water vapor content in gas to saturated water vapor content in the same volume of gas at the same temperature and pressure. The common symbol is% R.H. The hygrometer is widely used. For example, in the production processes such as ultra-pure metal smelting, textile processing, paper making and printing and dyeing, as well as food storage and meteorological measurement, it is often necessary to measure or control the humidity of 空 gas or industrial process gas.

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