## Homework Problem 8.3 Using Proper Units

$w=-P\Delta V$
and
$w=-\int_{V_{1}}^{V_{2}}PdV=-nRTln\frac{V_{2}}{V_{1}}$

Ardo 2K
Posts: 31
Joined: Fri Sep 29, 2017 7:05 am

### Homework Problem 8.3 Using Proper Units

For problem 8.3 when finding the change in the volume of the bicycle pump in order to find the work, the solutions manual found it in liters, but in the book it states that when finding work we should only work in Pascals for pressure and meters cubed for volume. It makes the conversion for Pascals but not to meters cubed, so is it fine to keep the change in volume in liters?
Thank you

Danah Albaaj 1I
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

### Re: Homework Problem 8.3 Using Proper Units

The problem provides you with the volume in centimeters cubed and the pressure in atm. In this case it is best if you convert the volume to liters in order to perform the conversions for joules. If the pressure had already been in pascals, then having the volume be in liters would have been unnecessary.