Describe how a hygrometer is used to measure relative humidity

A hygrometer measures relative humidity using two thermometers: a dry bulb and a wet bulb. 1. The dry bulb thermometer measures the air temperature directly. 2. The wet bulb thermometer has a cloth wick that is soaked in water. As water evaporates from the wick, it cools the thermometer, resulting in a lower temperature reading. The difference in temperature between the dry bulb (T_d) and wet bulb (T_w) is used to calculate relative humidity (RH) using the formula: RH = (E_w / E_s) × 100% Where: E_w is the vapor pressure at the wet bulb temperature. E_s is the saturation vapor pressure at the dry bulb temperature. By comparing these temperatures, you can determine the relative humidity of the air.