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大氣壓強是不能用公式P=ρ空氣gh(或者P=r空氣g,)來計算的: 1.氣體所以產生壓強,還與分子之間的相互撞擊有關. 2.大氣的密度是變化的,在地面附近空氣的密度較大,隨着高度的增加,密度越來越小; 3.h值怎麼確定呀,要知道大氣的“上端”沒有一個明顯的界面. 在高度不超過2km時,一般用等溫氣壓公式來計算的.(是由氣體狀態方程式推倒來的.)
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