水是人体一个重要的热调节器,人体利用呼吸和皮肤的出汗来实现对体温的调节。即使人处于低温环境,皮肤和呼吸道也不断地有水分渗出而被蒸发(称为不感蒸发)。在环境温度30℃以下时,不感蒸发比较恒定,最高可达每天1升左右,因此一夜睡来,人人都应及时补充水分。此外,尿液、粪便,以及一些疾病(腹泻、 Water is an important thermoregulator for the human body. The human body uses the breath and the sweat of the skin to achieve the regulation of body temperature. Even if the person is in a cold environment, the skin and respiratory tract are constantly being exuded by moisture and evaporated (called “no sensation of evaporation”). In the ambient temperature below 30 ℃, the sense of evaporation is relatively constant, up to 1 liter per day or so, so sleep overnight, everyone should be timely replenishment of water. In addition, urine, stool, as well as some diseases (diarrhea,