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    Question

    Which of the following instruments is used to measure

    humidity?
    A Kata Thermometer Correct Answer Incorrect Answer
    B Anemometer Correct Answer Incorrect Answer
    C Sling Psychrometer Correct Answer Incorrect Answer
    D Clinical Thermometer Correct Answer Incorrect Answer

    Solution

    A psychrometer consists of two thermometers, one which is dry and one which is kept moist with distilled water on a sock or wick. The two thermometers are thus called the dry-bulb and the wet-bulb. Relative humidity is computed from the ambient temperature as shown by the dry-bulb thermometer and the difference in temperatures as shown by the wet-bulb and dry-bulb thermometers. The sling psychrometer, where the thermometers are attached to a handle or length of rope and spun around in the air for a few minutes, is sometimes used for field measurements, but is being replaced by more convenient electronic sensors.

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