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。
This value was intended to represent the mean atmospheric pressure at mean sea level at the latitude of Paris, France.
此值代表法国巴黎所在的纬度上平均海拔高度的平均大气压力。
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