units for calculating work


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Lindsay H 2B
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units for calculating work

Postby Lindsay H 2B » Thu Jan 18, 2018 10:10 pm

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?

Gianna Apoderado 1B
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Re: units for calculating work

Postby Gianna Apoderado 1B » Thu Jan 18, 2018 10:15 pm

I would stick with atm for pressure and liters (L) for volume when calculating work using w=-P*deltaV.

Ya Gao
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Re: units for calculating work

Postby Ya Gao » Thu Jan 18, 2018 10:16 pm

I'll say use liter for volume and atm for pressure.

Sandhya Rajkumar 1C
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Joined: Fri Jun 23, 2017 11:40 am

Re: units for calculating work

Postby Sandhya Rajkumar 1C » Fri Jan 19, 2018 1:20 pm

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).

204918982
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Re: units for calculating work

Postby 204918982 » Fri Jan 19, 2018 2:03 pm

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.

Yu Chong 2H
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Re: units for calculating work

Postby Yu Chong 2H » Fri Jan 19, 2018 2:16 pm

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.

Mika Sonnleitner 1A
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Re: units for calculating work

Postby Mika Sonnleitner 1A » Fri Jan 19, 2018 2:27 pm

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.


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