Question

First law of thermodynamics and its differential form

Answer 1

The first law of thermodynamics is a version of the law of conservation of energy, adapted for thermodynamic systems. The law of conservation of energy states that the totalenergy of an isolated system is constant; energy can be transformed from one form to another, but can be neither created nor destroyed. The first law is often formulated[1][nb 1]

{\displaystyle \Delta U=Q-W.}

It states that the change in the internal energyΔU of a closed system is equal to the amount of heat Q supplied to the system, minus the amount of work W done by the system on its surroundings. An equivalent statement is thatperpetual motion machines of the first kind are impossible.

Answer 2

The first law of thermodynamics states that "energy can neither be created nor destroyed, only altered in the form"

• The universe's energy is constant, according to the first law of thermodynamics.
• It cannot be generated or destroyed, but it may be exchanged between the system and its surroundings.
• The law essentially deals with how work and heat transport cause changes in energy states. It describes the idea of energy conservation.

• The first law of thermodynamics equation is

                                    ΔU = q + W

Here,

U = The system's internal energy change.

q = The algebraic total of heat transmission from the system to its surroundings.

W = The system's interaction with its environment.

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