杯裤晌脊底受到煤油的压力:F=PS=hρgS=10cm*0.8×10^3kg/m^3*10N/kg*20cm^2=0.1m*0.8×10^3kg/谨核m^3*10N/kg*0.002m^2=1.6N玻璃杯对水平桌面胡渗的压强:P=F/S=(3.2N+0.8N)/20cm^2=(3.2N+0.8N)/0.002m^2=2000Pa