what instrument is used to measure water vapor content of air?
Hygrometer
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Relative humidity can be measured with a hygrometer (Fig. 2) or a psychrometer.
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The instrument used to measure the water vapor content of air is called a hygrometer.
Hygrometers come in various types, with each one utilizing different principles to measure humidity. The most common types of hygrometers include:
1. Psychrometers: These consist of two thermometers, one of which has a dry bulb and the other a wet bulb. The evaporation of water from the wet bulb results in a cooling effect, and the difference in temperature between the two bulbs helps determine the humidity.
2. Electronic Hygrometers: These are based on electrical properties that change with humidity, such as capacitance or resistance. The sensor within the hygrometer detects these changes and provides a corresponding humidity reading.
3. Dew Point Hygrometers: These devices measure the temperature at which water vapor in the air begins to condense into liquid water. By knowing the dew point temperature and the ambient temperature, the humidity can be calculated.
To measure the water vapor content of air using a hygrometer, you would need to follow the specific operational instructions provided by the manufacturer of the instrument.