Physics

First Law of Thermodynamics

Apply ΔU = Q − W to find internal energy change, heat added, or work done.

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Inputs
Sign Conventions:
Q > 0: heat added TO system  |  Q < 0: heat removed FROM system
W > 0: work done BY system  |  W < 0: work done ON system
Result
Result
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Step-by-Step Work

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System Energy Diagram