When doing calculations, should pressure be in atm or Pa?

1. Nov 23, 2006

Lee

When doing calculations, should pressure be in atm or Pa? (looking for answers in joules)

2. Nov 23, 2006

zaguar

Doesn't matter AFAIK as long as you adjust the constants for example R in PV=nRT.

3. Nov 23, 2006

Lee

Good'o. I jsut wanted to double check.

4. Nov 23, 2006

Max Eilerson

Use Pascals. P = F / A, Force is usually given in Newtons amd 1 Pa = 1 Nm^-2.

Last edited: Nov 23, 2006
5. Nov 24, 2006

ppithermo

all you need is to have is consistant units.
pressure in Pa, volume in cubic meters and R = 8.3145 J mol^-1 K^-1
then work will be in joules

Last edited: Nov 24, 2006
6. Nov 24, 2006

dextercioby

Always choose the path with the least number of conversions.

Daniel.