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人类生活在大气海洋的“洋底”,象深海动物适应海水压强一样,我们已经适应了大气压强.人类离不开大气压强,并且依靠大气压生存.下面介绍几个具体实例。1.呼吸与大气压我们在吸气时,胸腔和腹腔间的横膈肌肉收缩,胸腔容积扩大,肺内气体压强变小,于是外界空气就在大气压力作用下被吸入体内.呼气时,情况正好相反,胸腔容积缩小,肺内气体压强变大,由于比外界大气压高,气体就被呼出体外.可以说,没有大气压我们连最基本的呼吸都不能进行.
Human beings live in the “ocean bottom” of the oceans and oceans. Just as deep-sea animals adapt to seawater pressure, we have adapted to atmospheric pressure. Humans can not live without atmospheric pressure and rely on atmospheric pressure for survival. Here are some specific examples. 1. Breathing and Atmospheric Pressure When we inhale, the diaphragm between the chest and abdomen contracts, the volume of the chest cavity expands, and the pressure in the lungs decreases, so that the outside air is inhaled into the body under the influence of atmospheric pressure. On the contrary, the volume of the chest cavity is reduced and the gas pressure in the lungs becomes larger. Because the atmospheric pressure is higher than the outside, the gas is exhaled. It can be said that without the atmospheric pressure, we cannot even perform the most basic breathing.