Question

Is heat a conserved quantity? How is it not conserved?

Answer 1

Heat is NOT a conserved quantity. Heat (Q) is one form of energy. Other forms of energy are work (W), chemical energy (C), electromagnetic energy (E) etc.

The 1st principle of thermodynamics tells you that, what is conserved is the overall internal energy,

U = W + Q + C + E +...

(the list of terms in the sum depends on what phenomenon is at stake in your system).

Answer 2

Yes, heat is a quantity which is conserved.

Explanation:

• Suppose there are two bodies X and Y at different temperatures, whereby X is higher and Y lower.
• The heat provided by X is equal to the heat obtained by Y when they are placed in contact.
• Therefore the heat in the device is conserved.
• We also missed the heat that was shared with the surroundings here.
• The heat of the system would be conserved if we find the surroundings.

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