Hygrometer

A hygrometer is an instrument that measures humidity, that is, how much water vapor is present in the air. Humidity measurement instruments usually rely on measurements of some other quantities, such as temperature, pressure, mass, and mechanical or electrical changes in a substance as moisture is absorbed. By calibration and calculation, these measured quantities can be used to indicate the humidity.

Modern electronic devices use the temperature of condensation, or they sense changes in electrical capacitance or resistance.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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