Question

existence of internal energy as state variable is defined by?
1.law of conservation of energy
2.first law of thermodynamics
3. second law of thermodynamics
4.all​

Answer 1

Answer:

he 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. ... Similarly work done on the system is assigned a negative sign.