- #1

- 1

- 0

- Thread starter shawn100
- Start date

- #1

- 1

- 0

- #2

Andrew Mason

Science Advisor

Homework Helper

- 7,652

- 383

Use PV=nRT.shawn100 said:

If T is constant then [itex]P_iV_i = P_fV_f[/itex]. So you can work out what the final volume is.

The work is:

[tex]W = \int_{P_i}^{P_f} PdV = \int_{V_i}^{V_f} \frac{nRT}{V}dV [/tex]

You have to work out that integral (hint: [itex]\frac{d}{dV}ln V = 1/V[/itex]) and plug in the initial and final volumes.

You don't have to do any conversions. You just need the pressure ratio P_f/P_i.

AM

[edit: this last comment is not quite correct. You do have to work out nRT = P_iV_i which means you have to do a conversion. PSIA is absolute pressure in pounds/in^2, which means you have to include atmospheric pressure. PSIG is gauge pressure, which is 1 atm less than actual. It is easier to work in MKS. I would convert to MKS and then convert back.]

AM

Last edited:

- Last Post

- Replies
- 5

- Views
- 5K

- Last Post

- Replies
- 0

- Views
- 2K

- Last Post

- Replies
- 1

- Views
- 2K

- Last Post

- Replies
- 4

- Views
- 7K

- Last Post

- Replies
- 5

- Views
- 536

- Last Post

- Replies
- 5

- Views
- 5K

- Last Post

- Replies
- 3

- Views
- 9K

- Last Post

- Replies
- 1

- Views
- 2K

- Last Post

- Replies
- 5

- Views
- 21K

- Last Post

- Replies
- 1

- Views
- 2K