Multiple choice general knowledge

The instrument used for measuring humidity is

  1. Thermometer

  2. Barometer

  3. Hydrometer

  4. Hygrometer

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A hygrometer measures humidity (water vapor content in air). Thermometers measure temperature, barometers measure atmospheric pressure, and hydrometers measure liquid density - none measure humidity.