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What are the IUPAC sign conventions of Q, U and W?

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In thermodynamics, the sign conventions are adopted according to IUPAC convention, based on acquisition of energy.

(i) Heat absorbed = +Q 

Heat evolved = -Q 

(ii) Internal energy change : 

Increase in energy = + ΔU 

Decrease in energy = – ΔU

(iii) Work done by the system = – W 

Work done on the system = + W

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