Liquid part

For the liquid part {liquid+vapor}, the bulk modulus is computed as:

With:

Giving:

Or:

Equation 16: {liquid + vapor} bulk modulus

The last term in the denominator accounts for changes in the proportions of vapor and liquid as pressure varies. We have:

And:

This gives for the three cases for the {liquid+vapor}:

Case	{liquid+vapor} bulk modulus Bliq+vap
Case 1:	P > PHvap
Case 2:	PLvap < P < PHvap
Case 3:	P < PLvap