Humidity of air can be determined by a
A. chromatograph
B. sling psychrometer
C. mass spectrometer
D. polarimeter
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Answer: B
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The suspended psychrometer is a type of hygrometer, which is mainly used to measure relative humidity. In order to measure the relative humidity in the environment, the psychrometer relies on the fact that humidity changes the rate of evaporation.
The device includes two thermometers. One is a dry bulb thermometer, which is exposed to ambient air to measure the temperature, and the second is a wet bulb thermometer, where the bulb is immersed in a wet material.
The evaporation process will cool down the wet bulb thermometer, resulting in lower readings than the dry bulb thermometer.
The drier it is, the faster the water evaporates, and the more intense the cooling effect. One can compare two temperatures and determine the humidity based on the difference. When the readings of the two thermometers are the same, the relative humidity is 100%.
The suspended psychrometer is used to oscillate in the air to accelerate the evaporation rate. You must be careful to avoid heating the thermometer or placing it in a location that may skew the reading.You can buy this kind of small instrument, or you can make it yourself at home.
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