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Define 1st law of thermodynamics ?

Answer 1

Answer:

The 1st law of thermodynamics is Energy cannot be created nor destroyed it can only transform from one form to another form

Answer 2

Answer:

The first law of thermodynamics is a version of the law of conservation of energy, adapted for thermodynamic processes, distinguishing three kinds of transfer of energy, as heat, as thermodynamic work, and as energy associated with matter transfer, and relating them to a function of a body's state, called internal energy.

The law of conservation of energy states that the total energy of any isolated system (for which energy and matter transfer through the system boundary are not possible) is constant; energy can be transformed from one form to another, but can be neither created nor destroyed.

The first law asserts that if heat is recognized as a form of energy, then the total energy of a system plus its surroundings is conserved; in other words, the total energy of the universe remains constant.

ΔU=Q-W

ΔU- change in internal energy

Q-heat added

W-work done by system