Work equation


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Katie Clark 3B
Posts: 26
Joined: Fri Sep 25, 2015 3:00 am

Work equation

Postby Katie Clark 3B » Sat Jan 16, 2016 9:15 pm

Why is there a negative in the work equation w=-PΔV?

Ranger Saldivar 2D
Posts: 28
Joined: Fri Sep 25, 2015 3:00 am

Re: Work equation

Postby Ranger Saldivar 2D » Sat Jan 16, 2016 9:22 pm

If you are expanding a gas by a constant external pressure to match the positive difference in V you need to account for the loss in work by putting a negative sign in front of the equation.

KendraArriaga 1F
Posts: 10
Joined: Fri Sep 25, 2015 3:00 am

Re: Work equation

Postby KendraArriaga 1F » Sat Jan 16, 2016 10:39 pm

When a gas expands, it does work against the lid that contains it - the gas is "pushing" against the lid and is ultimately losing energy. Therefore, the negative sign is incorporated into the equation to show that its expansion represents a loss of energy.


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