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Nayeon Kang 2M
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Postby Nayeon Kang 2M » Fri Jan 20, 2017 10:03 am

In U=q+w equation, does q always has to be under constant pressure? Are there any exceptions?

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Joined: Wed Sep 21, 2016 2:57 pm

Re: U=q+w  [ENDORSED]

Postby Tycho_Meimban_2B » Fri Jan 20, 2017 10:58 am

For the equation deltaU = q + w, q does not always have* to be at constant pressure.

As this is a representation for the first law of thermodynamics, which states that energy can be converted from one form to another with the interaction of heat, work and internal energy, but it cannot be created nor destroyed, under any circumstances, a change in constant pressure will not in any way break the First Law of Thermodynamics. A change in pressure will alter the values of q and w, but it will not break the law itself.

Hope this would have* helped.

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