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防尘帽净化气流有两个作用:一是供防尘帽使用者呼吸,二是带走使用者头部散发出来的热量。从而使防尘帽的使用者既能防止粉尘的危害,又具有一定的舒适感觉。 人们在进行体力劳动时,交换空气的数量急剧增加。然而肺泡空气以及呼出空气的组成几乎仍然保持在同一水平。在人的呼吸过程中,二氧化碳的排出量和氧气的吸入量之比,大约在0.8—0.95之间。这个比值,称为呼吸系数。它的变化与饮食情况无关,通常用它来作为衡量人们进行量体力劳动的一
Dust cap to purify air flow has two roles: First, for dust cap users to breathe, and second, take away the heat emitted from the user’s head. As a result, the user of the dust cap can prevent the dust from damaging as well as have a certain comfortable feeling. The amount of exchange air has dramatically increased during physical labor. However, the composition of alveolar air and exhaled air remained almost the same. In the process of human breathing, the ratio of carbon dioxide emissions and oxygen inhalation, between about 0.8-0.95. This ratio, called the respiratory coefficient. Its change has nothing to do with the diet, it is usually used as a measure of the amount of physical labor