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Postby sas_budge_1l » Sun Feb 12, 2017 10:36 pm

If ΔT=0 and w=100J. ΔU = q+w =0 which means q= -w= -1000J.
Why does q=-1000 not q=0? because if ΔT=0 and you use the equation q=nCΔT wouldn't q=0 not q=-1000J?

Sunny Chera 1N
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Joined: Wed Sep 21, 2016 2:56 pm

Re: Work

Postby Sunny Chera 1N » Sun Feb 12, 2017 11:00 pm

When delta U=0, in the case of isothermal expansion, the internal energy lost as work is replaced by heat. If heat were to be zero (q=0), then this would not be isothermal expansion. If a piston does 1000 J of work, then 1000 J of energy is replaced in the form of heat.

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