# Balloon - variation of volume with mass.

1. Mar 21, 2007

### In_Development

1. The problem statement, all variables and given/known data
Well, I think I could figure this out, but I have limited time, and apparently it isn't meant to be in THAT much detail.

I'm attempting to assess how the volume of a balloon will vary with mass of gas added to it. It doesn't have to be exact.

2. Relevant equations
I'm assuming Hooke's law holds true for the elasticity of the balloon - that is, force exerted upon the gas is proportional to linear dimension.

F = ke

Also, for pressure:

P = Force/Area

Also, for the gas pressure

P = nRT/V

3. The attempt at a solution

I decided to equate both solutions, so that

F/A is proportional to n/V: temperature and, of course, gas constant, are constant, so I removed them.

All I want to know is if my start is correct.

Is making

Force/Area = nRT/Volume the right thing to do?