Which instrument measures humidity?

Which instrument measures humidity?

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

Answer: (B)

Humidity is the amount of water vapor in the air, often shown as relative humidity or dew point. The instrument that directly measures this property is the hygrometer. It detects changes in moisture using materials or sensors that respond to humidity, such as a human-hair element in older designs or electronic sensors in modern ones. The readings tell you how moist the air is, which affects comfort, condensation, and weather. Other tools measure different things: a barometer gauges atmospheric pressure, a thermometer measures temperature, and an anemometer measures wind speed. So the hygrometer is the right choice when you need to know how humid the air is.

Humidity is the amount of water vapor in the air, often shown as relative humidity or dew point. The instrument that directly measures this property is the hygrometer. It detects changes in moisture using materials or sensors that respond to humidity, such as a human-hair element in older designs or electronic sensors in modern ones. The readings tell you how moist the air is, which affects comfort, condensation, and weather.

Other tools measure different things: a barometer gauges atmospheric pressure, a thermometer measures temperature, and an anemometer measures wind speed. So the hygrometer is the right choice when you need to know how humid the air is.