Pressure caused by the weight of the atmosphere. at sea level it has a mean value of one atmosphere but reduces with increasing altitude.
因大气层的重量而产生的压力。在海平面上有一平均数值，即一个标准大气压，随着海拔高度增加而减小。
At sea level, ambient pressure already is 1 atmosphere.
在海平面，空气中的压力，已经是一日的气氛中进行。
The pressure exerted by the atmosphere on the earth's surface at sea-level is equal to that of a weight of 15pouds acting on every square inch;
空气在海平面上对地球表面施加的压力相当于每平方英寸15磅；
The pressure exerted by the atmosphere on the earth's surface at sea-level is equal to that of a weight of 15pouds acting on every square inch;
空气在海平面上对地球表面施加的压力相当于每平方英寸15磅；
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