A device used to measure relative humidity is known as?

• A. Thermometer
• B. Barometer
• C. Hygrometer
• D. Anemometer

Answer: (C)

A device used to measure relative humidity is known as a hygrometer. Hygrometers specifically measure moisture in the air and are essential tools in various fields, including meteorology, HVAC, and environmental science. They can help in monitoring conditions that could affect health, comfort, and material integrity. Different types of hygrometers operate based on varying principles, such as using a psychrometric approach or electrical capacitance to determine humidity levels.

In contrast, other devices serve different purposes. A thermometer measures temperature, providing essential information about heat but not moisture levels. A barometer is used to measure atmospheric pressure, which can indicate weather changes rather than humidity. An anemometer measures wind speed and is crucial for understanding air movement but does not provide any data on humidity. Understanding the specific functions of these devices highlights why the hygrometer is the appropriate choice for measuring relative humidity.