* How a Psychrometer Works: A psychrometer uses two thermometers: a dry bulb thermometer that measures the air temperature and a wet bulb thermometer that has a cloth wick around its bulb, which is moistened with water. The evaporation of water from the wet bulb cools it down.
* Evaporation and Humidity: The amount of cooling on the wet bulb depends on the relative humidity. If the air is dry (low humidity), the water evaporates more readily, leading to a larger temperature difference between the dry and wet bulbs. If the air is saturated with water vapor (high humidity), there's little evaporation, and the temperature difference is minimal.
* No Difference = Saturation: When the wet and dry bulb readings are the same, it indicates that the water on the wet bulb is not evaporating at all. This means the air is already holding as much water vapor as it possibly can at that temperature.
Therefore, if the wet and dry bulb readings are the same, you can assume the relative humidity is 100% (saturated air).
