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[Physics] 1st Principle of Thermodynamics [∆U = Q – L / ∆U = Q + W]  

Ari Horesh
(@ari)
Noble Member Community Founder Medical Student

Energy cannot be created or destroyed. 

∆U = Q –/+ L

When is L is positive and when is L is negative?

L performed by the system: POSITIVE

L performed on the system: NEGATIVE

Q is given to the system: POSITIVE

Q removed from the system: NEGATIVE

∆U = Q + W

W performed on the system: POSITIVE

W performed by the system: NEGATIVE

Q is given to the system: POSITIVE

Q removed from the system: NEGATIVE

 

 

 

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Topic starter Posted : 22/10/2019 4:04 pm
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