[Srhjnf]

Hi everyone:

I'm writing code for doing fluid flow calculations. I'm trying to figure out whether to make flow compressible or incompressible.  This is a big decision. 

When it does not contain bubbles, the fluid can be approximated as incompressible.  I want to know approximately how compressible the fluid can get when it contains a certain volume or mass fraction of H2O bubbles. 

How would I do this?

[curiouscat]

One idea would be to treat the water fraction as incompressible and model the bubble fraction by an ideal gas law. That should give you a net compressibility.