101325 1 atm mH2O 103×9.81 =10.33mH20 101325×103 1 atm mmHg 13.6×103×9.81 =760mmHg 1313 mH O 10 9.81 101325 1 atm 3 2  = mmHg 13.6 10 9.81 101325 10 1 atm 3 3    = =10.33 mH2 O = 760mmHg