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。
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。
Pressure caused by the weight of the atmosphere. at sea level it has a mean value of one atmosphere but reduces with increasing altitude.
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