Pressure

Pa
lbf/ft2
mbar
mm Hg
in H2O
kN/m2
in Hg
psi
kgf/cm2
bar
atm

1 Pa = 1 N/m2 = 1 kg/ms2 = 10 dyn/cm2

1 psi = 1 lbf/in2

1 mmHg = 1 torr (to within 1 part in 7 million)