At 100% relative humidity, the surrounding air is completely saturated with moisture and cannot hold any additional water vapor at its current ambient temperature. This extreme moisture level prevents human sweat from evaporating off the skin, which serves as our body's primary cooling mechanism. As a result, even moderate air temperatures feel stifling, oppressive, and heavily muggy, making the atmosphere feel thick, swampy, physically heavy to breathe, and significantly hotter than the actual thermometer reading indicates.
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