Which instrument is commonly used to measure relative humidity in the atmosphere based on the principle of psychrometry?

💡 Solution & Explanation

A sling psychrometer consists of two thermometers, one wet-bulb and one dry-bulb, and measures relative humidity through the cooling effect caused by water evaporation. Barometers measure atmospheric pressure, hydrometers measure liquid density, and anemometers measure wind speed. Relative humidity is expressed as a percentage representing the ratio of moisture in the air to the maximum possible moisture at that temperature.