Question

Psychrometers are used to measure :

• A. Temperature
• B. Sunshine
• C. Pressure
• D. Relative humidity

Answer 1

Answer:

D. Relative humidity

Psychrometers are used to measure relative humidity (or the moisture content in the air).

• How it works: A psychrometer consists of two thermometers:

  1. Dry-bulb thermometer: Measures the ambient air temperature.

  2. Wet-bulb thermometer: Has a bulb covered with a water-soaked cloth. As water evaporates from the wet cloth, it cools the thermometer.

• Calculation: The difference in temperature between the dry bulb and wet bulb (called the wet-bulb depression) is used along with a psychrometric chart to calculate relative humidity and dew point.