Which of the following statement states the first law of thermodynamics? (given: heat provided to the system is ΔQ, work done by the system is ΔW, and change in internal energy of the system is ΔU)
1
ΔQ + ΔU = ΔW
2
ΔQ = ΔU + ΔW
3
ΔQ + ΔU + ΔW = constant
4
All of the above statement can be correct