a0a647e4_Weather__Making_Hot_and_Cold__Statement
[True or False] 8 True [Statement] 
Sometimes when you step out of a shower or rub alcohol on your skin, your skin feels cool. This is mostly due to liquid evaporating from the skin. True. Evaporation is a process where molecules escape from the surface of a substance. Since the higher speed molecules are more likely to have enough energy to escape, evaporation reduces the average thermal energy of a substance and thus its temperature. Slow molecules are less able to escape because they lack the kinetic energy to overcome the effects of weak molecular attractive forces at the surface. The human body's mechanism for controlling its temperature is sweat. On a hot day, you sweat more and this helps to cool the body. This mechanism works best when the air is dry (low humidity). On a very humid day, the air is nearly saturated with water vapor and evaporation of liquid water from the skin is slowed.
Weather: Making Hot and Cold
Statement