Comment Re:Relaxing = Live longer? (Score 2) 208
Apparently it is sort of both.
There is a difference between relative and absolute humidity. The former is related to the the dew point.
If I understand it correctly, higher temperature (faster movement) of the water molecules raises the amount of molecules (in a volume of air) that need to be present to form water droplets. The amount of molecules in a certain volume of air is the absolute humidity, which can be very high in (Finnish) saunas. Due to the high temperature, however, no water droplets are formed in the air or on objects that are as hot as the air. This means that the relative humidity can be low at the same time. That also means that sweat can still evaporate relatively easily, which in turn allows the body to prevent overheating for a longer time.