我们在冬天手被冻的冰凉的时候，经常会把手放到嘴前面哈哈气，这样会暖一点，如果是吹气将会更冷。这是为什么呢？吹气和哈气，为什么会一冷一热呢？用嘴吹气时感觉比哈气时凉，主要是由嘴张开的形状不同和气流速度不同引起的。吹气时，嘴张开的面积较小，所以吹出的气体流动速度较快。由于摩擦力的存在，吹出的气体夹带起附近较多静止的冷空气一起运动，吹到手上时冷空气所占比例较大，从而会引起手上的水分或汗液等蒸发加快。蒸发是个吸热的过程，所以会感觉吹气是凉的。而当我们张大嘴巴对着手哈气时，嘴张开的面积较大，哈出的气体速度相对较慢。当哈出的气体撞击皮肤并返回的过程中，基本没有加速蒸发，人感觉到的更多的是哈出的热空气，所以会感觉哈气是热的。另外，如果我们吹气时，把手放得离嘴巴很近，基本上感觉到也是热的。这是因为离得太近，嘴里吹出的空气来不及夹带附近冷空气的缘故。
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