Posted on November 11, 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).
Silica gel is a hygroscopic material (captures water). It is a granular and porous form of silicon dioxide. In spite of its name, silica gel is a solid. It is usually found as small spheres packed in breathable bags. In this form, it is used as a drying agent to control local humidity and avoid deterioration of goods. In this experiment we will use silica gel and a relative humidity sensor in order to observe changes in relative humidity.
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