What type of sensor is utilized to measure humidity in the air?

A humidity sensor is specifically designed to measure the amount of water vapor present in the air. It provides readings in terms of relative humidity, which indicates how much moisture is in the air compared to the maximum amount of moisture the air can hold at a given temperature. These sensors often utilize materials that change their electrical properties with humidity, allowing them to accurately detect and report humidity levels.

In contrast, a temperature sensor measures the heat of the environment, a moisture sensor typically gauges the moisture content in soil or other materials rather than air, and a pressure sensor measures atmospheric or fluid pressure. Each of these devices serves distinct purposes and operates under different principles, which is why the humidity sensor is the appropriate choice for measuring humidity in the air.