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Describe how humidity is measured by using hair type hygrometer.

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Explanation: It consists of bunch of human hair which increases mechanical strength of the instrument, arm with pivot joints and points scale assembly. The element is maintained at slight tension by a spring. The hair strands are generally arranged parallel to each other with sufficient space between them for giving free access to the air sample whose humidity is to be measured. The indicator scale is directly calibrated to give a direct indication of humidity. The pointer or recording pen is operated through mechanical linkage. As the relative humidity surrounding to that of hygrometer increases, length of hair strands increases, which move the pointer on the calibrated scale for maximum value.

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