Posted on July 15, 2014
Relative humidity is the most common way for describing atmospheric moisture, but it does not describe the actual amount of water vapor in the air. Instead, it indicates how close the air is to being saturated. The relative humidity (RH) is the ratio between the amount of water vapor actually in the air and the maximum amount of water vapor required for saturation at that specific temperature (and pressure). When the amount of moisture in the air remains constant and the temperature increases, relative humidity decreases. The combination of temperature data and relative humidity data gives us the dew point temperature, which is a better indicator of the amount of moisture in the air than only relative humidity. Dew point temperature is defined as the temperature at which dew begins to form. The higher the dew point, the more moisture is in the air. In this activity we will measure relative humidity and temperature throughout a period of 24 hours. Relative humidity and temperature data can also be inserted into a dew point calculator.
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