Answer
Mar 27, 2025 - 10:26 AM
A humidity sensor, or hygrometer, measures the amount of moisture in the air by detecting changes in electrical resistance, capacitance, or thermal conductivity. In a capacitive humidity sensor, a hygroscopic dielectric material absorbs moisture, causing changes in capacitance that are proportional to the humidity level. In a resistive humidity sensor, a conductive polymer or salt film changes resistance as it absorbs water, allowing the sensor to measure humidity based on these variations.
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