每个人大约都做过往手上“吹气”和“哈气”两个动作,也都感觉到“吹气”和“哈气”的效果不同。那么,同是嘴里出来的一样温度的气,但为什么效果会不同?怎样解释呢?我们先分析“吹气”的过程。“吹气”时,嘴里出来的气流速度一般较快。由于气流速度快,就有如下的特点:(一)气流快,使手的附近空气形成“强迫对流”,离手稍远的冷空气会来补充,(二)气流快,使手表皮汗腺中的水分蒸发加快,带走更 Everyone has done two movements of “blowing air” and “air-breathing” in their past hands, and they both feel the effects of “blowing air” and “air-breathing” are different. Well, the same temperature is the same gas out of his mouth, but why the effect will be different? How to explain it? We first analyze the “blowing” process. “Blowing”, the gas flow out of his mouth generally faster. As the air flow speed, there are the following characteristics: (A) fast airflow, the air near the hand to form a “forced convection”, cold air slightly away from the hand will be added, (B) fast air flow, so that the sweat glands in the watch The evaporation of water to speed up, take away more