# Ideal gas

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1. Oct 5, 2014

### Arun Raja

1. The problem statement, all variables and given/known data
http://puu.sh/c0rhe/fb6b48f890.png [Broken]

2. Relevant equations
PV=constant

3. The attempt at a solution

Last edited by a moderator: May 7, 2017
2. Oct 5, 2014

### ehild

The above equation (PV=const) can not be applied. For what process is it valid? What process is the problem about?

ehild

3. Oct 6, 2014

### Arun Raja

It is a isobaric process.

4. Oct 6, 2014

### ehild

Remember the ideal gas law. What equation holds between V and T in an isobaric process?

5. Oct 6, 2014

### Arun Raja

V/T=k

but how is this supposed help me answer the question?
Pls provide some help.
I am having my exams tmrw

6. Oct 6, 2014

### Staff: Mentor

Perhaps you could do it in a couple of steps?

The graph B shows the V-T plot for a mass m at a constant pressure P. What would be the V-T plot for one quarter of that mass, m/4, at the same constant pressure P?

Finally, what would now be the plot for m/4 at half the pressure, viz., P/2?