Why do we sweat more on a humid day?
Humidity is the measure of water vapor content in the air. Humidity also is reflected by dew point. Dew point is the temperatures air must be cooled in order to reach saturation.
When you have a high dew point which indicates more moisture present in the air, the body takes a longer time to naturally cool off.
The human body cools off by the process of evaporative cooling. Evaporative cooling is temperature reduction resulting from the evaporation of a liquid. Also, on a more scientific note,...