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units for calculating work

Posted: Thu Jan 18, 2018 10:10 pm
by Lindsay H 2B
when calculating the work using w=-P∆V, what units are best to use for pressure and volume in order to get work in joules?

Re: units for calculating work

Posted: Thu Jan 18, 2018 10:15 pm
by Gianna Apoderado 1B
I would stick with atm for pressure and liters (L) for volume when calculating work using w=-P*deltaV.

Re: units for calculating work

Posted: Thu Jan 18, 2018 10:16 pm
by Ya Gao
I'll say use liter for volume and atm for pressure.

Re: units for calculating work

Posted: Fri Jan 19, 2018 1:20 pm
by Sandhya Rajkumar 1C
I think that atm is best for pressure and L is best for volume because then you can just convert from L.atm to J (1 L.atm = 101.325 J).

Re: units for calculating work

Posted: Fri Jan 19, 2018 2:03 pm
by 204918982
atm and liters would probably be the best units since the conversion of L.atm to joules will be given to us on the constants and formulas sheet.

Re: units for calculating work

Posted: Fri Jan 19, 2018 2:16 pm
by Yu Chong 2H
Use for volume and atm for pressure. Even if the question gives you a pressure unit that is not in atm, converting to atm might help make answering easier. The conversion between the various pressure units will be on the formula sheet.

Re: units for calculating work

Posted: Fri Jan 19, 2018 2:27 pm
by Mika Sonnleitner 1A
If you use the equation w = -P∆V, the units are kg/m⋅s² (m³) ,which is equal to kg⋅m²/s², which is the equivalent of Joules. Alternatively, you could multiply by 101.325 J/L⋅atm, which would result in work with units of Joules.