# Energy req'd to compress a gas?

1. Dec 17, 2008

### ProtoBob

Hi, I am trying to figure out how much energy would be required to compress air from 100ml
volume to 50ml, and also to 25ml volume.....

A nudge in the right direction would be great!

Thank you! :)

2. Dec 17, 2008

### Vanadium 50

Staff Emeritus
Work is force times distance. Pressure is force per unit area. Pressure times volume of a gas is a constant. Enough of a nudge?

3. Dec 20, 2008

### ProtoBob

So if the volume were initially 100 ml and the pressure is 14.7 psi then when compressed to 1/2 the volume, would the pressure then be 14.7 * 2 = 29.4 psi?

4. Dec 20, 2008

### Dadface

The answer will liie between two extremesThe minimum energy is when the gas is compressed isothermally [infinitely slowly ]and the maximum when it is compressed adiabatically[infinitely rapidly].

5. Dec 21, 2008

### ProtoBob

Could you explain isothermally and adiabatically?

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