Consider a psychrometer, which is a device used to measure the humidity of the air. It consists of two thermometers termed “wet” and “dry” bulbs. The wet bulb is covered with a wick wet with water. On...

Consider a psychrometer, which is a device used to measure the humidity of the air. It consists of two thermometers termed “wet” and “dry” bulbs. The wet bulb is covered with a wick wet with water. On rapidly spinning the thermometers in the air, the wet bulb cools because of evaporation. Determine the relationship between the wet-bulb temperature and the humidity of the air (see Figure E6.1).