h=100m L=1000m dF= pda= pLdy da 令大气压为P0,则 p=po+pg(h-y dF=[po+pg(h-y)lLdy0 F=IPo+ pg(h-y)]Ldy= poLh+pgLh 2 代入数据,得 F=591×100N( ) 0 p = p + g h − y 令大气压为 p0 ，则 dF [ p g(h y)]Ldy = 0 +  − 2 0 0 0 2 1 F [ p g(h y)]Ldy p Lh gLh h = +  − = +   代入数据，得 5.91 10 N 10 F =  dF = pdA = pLdy y O h y x dA dy h =100m L =1000m