压强=ρgh=1*1000*9.8*0.2=1.96 (牛/平方米)
压力=压强/底面积=1.96/(0.03-0.005)=1.96/0.025=78.4
P=ρgh=1×1000kg/m³×9.8N/kg×0.2m应该是=1960Pa