Question

thermodynamic variable first law

Answer 1

The first law ofthermodynamics defines the internal energy (E) as equal to the difference of the heat transfer (Q) into a system and the work (W) done by the system. We have emphasized the words "into" and "by" in the definition

Answer 2

The internal energy is a state variable, just like the temperature or the pressure. The first law of thermodynamics defines the internal energy (E) as equal to the difference of the heat transfer (Q) into a system and the work (W) done by the system. We have emphasized the words "into" and "by" in the definition.