## Units

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

Sue Xu 2K
Posts: 58
Joined: Fri Sep 29, 2017 7:06 am

### Units

What is the unit of P, pressure in the w=-P delta V ? And is Torr the same as Pa?

Posts: 31
Joined: Sat Jul 22, 2017 3:00 am

### Re: Units

According to Table 8.1 on page 262 of the textbook, they note the standard convention of using units of Pascals (Pa) for pressure. However, Example 8.1 on page 264 gives a provides a good practice problem in which atm is used instead of pascals for pressure, and liters instead of meters cubed for volume, which was then converted to joules. Hope this helped!

edit: I forgot to answer the question about Torr. Torr is not the same as pascals. 1 torr = 1atm/760. So therefore, 1 torr = 101,325 Pa/760

Rohan Chaudhari- 1K
Posts: 32
Joined: Fri Sep 29, 2017 7:06 am

### Re: Units

1 atm is equal to 760 torr. The unit for P in w=-PdeltaV is usually in atm as the answer to this equation is then usually converted to J using (101.325J/L*atm).