Sign convention in Fisrt law of thermodynamics.
Sign convection for the first law of thermodynamics
If delta U is positive then it is an increase in internal energy
If delta U is negative internal energy decreases.
If q is positive then heat is added to the system
If q is negative heat is taken away from system
If W is positive work is done on the system or the gas is compressed
If W is negative work is done by the system or the gas expands/
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