On hot summer days like these, it's worthwhile to stop and think about the obvious. Here's one simple question: why does a fan cool you down? After all, fans just move air from one location to another. How does that produce coolness? Especially in a closed room, where all air is roughly the same temperature, this doesn't make sense.
Trust internet to give us the answer. The handy How Stuff Works Web site tells us that fans actually help evaporate the sweat from our skin by the continuous stream of air passing over it. This is know as the wind chill effect. Sweating eliminates body heat, so the longer and the faster the fan blows, the more you cool down.

Posted by cronopio at 01:55 PM, August 07, 2006