ciśnienie
paskal hPa atmosfera
Bar tor mm słupa rtęci 1 Pa = 1 Nnr2
1 hPa= 100 Pa
1 atm= 101,325 103N m 2 1 bar = 1105Pa = 1105 Nnr2 1 Tr= 1 / 760 atm= 133,322 N m2 1 mm Hg = 1 Tr = 133,322 N m 2