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Hygrometers measure the amount of humidity in the air. This one, which is showing very high humidity, has a thermometer. Photo by Alex Tihonov/Getty Images
Air has water vapor or humidity we are sensitive to, our skin especially. We sweat to stay cool, but when the air s relative humidity is super high, our sweat won t evaporate. You know that sticky feeling when you re saturated with sweat. As a result, it feels much hotter than it actually is when humidity is high.
The reverse is true when humidity in the air is low; our sweat evaporates easily, which cools us off. But how do you know what the humidity level is? You can use a hygrometer to find out.