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Topic: thermodynamic's first law  (Read 8530 times)

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Offline HusamEddin

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Re: thermodynamic's first law
« Reply #15 on: November 17, 2012, 08:03:42 AM »
waiting :)

Offline juanrga

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Re: thermodynamic's first law
« Reply #16 on: November 22, 2012, 05:51:02 AM »
thanks alot my friend
my exam travelled to the next Monday
mmmmm
some thing wrong happened
while I was turning my pages (my chemistry notebook)
I found that my doctor told us that ΔE = Qrev. - w
where Qrev. means Q(reversible)
this made me crazy
my knowledge that (q) here is not necessery to be reversible !!!

can you explain please !

ΔE = Q - w

where heat Q can be due to reversible process or not.

Chemists prefer to use the modern form (this is the recommended form)

ΔE = Q + W

where W = -w

The law ΔE = Q + W is valid for both reversible and irreversible processes.
Sharing unified knowledge in pure and applied sciences

Offline HusamEddin

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Re: thermodynamic's first law
« Reply #17 on: November 22, 2012, 11:54:45 AM »
thank you very much my friend .  understood :)

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