Re: Mass of gas paticles vs. liquid mass

> If you have say 100 particles of water in a gas state, does that have 
> the same mass as 100 particles of water in a liquid state? 

Yes, Heather. 100 molecules of water weigh the same regardless.

However, in the gas phase they will take up a lot more room. Molecules in the 
liquid or solid phase are in contact with each other, but molecules in the
gas phase are well-separated one from the other. This means that water
vapor will be much less *dense* than liquid water; density is mass per
unit volume.

                                              Dan Berger