### Units

Posted:

**Thu Jan 25, 2018 9:03 pm**What is the unit of P, pressure in the w=-P delta V ? And is Torr the same as Pa?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=129&t=26363

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Posted: **Thu Jan 25, 2018 9:03 pm**

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

Posted: **Thu Jan 25, 2018 9:08 pm**

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

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

Posted: **Thu Jan 25, 2018 9:19 pm**

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).