  We report an ulsrasonic measurements of density and bulk modulus of propylene
glycol at room temperature and at the temperature of liquid nitrogen combined
with molecular dynamics simulations with two different force fields. We find
that experimental density of propylene glycol at room temperature is well
described within COMPASS force fields simulations, while the bulk modulus from
simulation deviates from the experimental one. Number of hydrogen bonds in
propylene glycol is also evaluated.
