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  4. Which of the following is the correct equation?

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Q. Which of the following is the correct equation?

AIPMTAIPMT 1996Thermodynamics

Solution:

$\Delta U =\Delta Q + W$
This is the mathematical relation of the first law of thermodynamics.
Here,
$\Delta U =$ change in internal energy;
$\Delta Q =$ heat absorbed by the system and
$W =$ work done by the system.