# Which physical law underlies the first law of thermodynamics

## Which property is defined by the first law of thermodynamics?

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.

## What is the adiabatic form of the first law of thermodynamics?

change in air temp-pressure change. describes the adiabatic form of the first law of thermodynamics. absolute zero. temperature at which no more energy can be extracted from a substance and no further lowering of its temperature is possible. thermal motion and kinetic motion.

## Which of the following does the first law of thermodynamics apply?

The first law of thermodynamics, also known as Law of Conservation of Energy, states that energy can neither be created nor destroyed; energy can only be transferred or changed from one form to another. For example, turning on a light would seem to produce energy; however, it is electrical energy that is converted.

## What violates the first law of thermodynamics?

Perpetual Motion Machines

A device that violates the First law of thermodynamics (by creating energy) is called a Perpetual Motion Machine of the first kind. … The first device supplies continuously energy with out receiving it. So this is a system creating energy and therefore violating the first law.

Rudolf Clausius

## What is the importance of first law of thermodynamics?

The First Law of Thermodynamics is an expression of the principle of conservation of energy. It states that energy is always conserved, it cannot be created or destroyed. It can be converted from one form to another. According to this law the total amount of energy and matter remains constant in the Universe.

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## What does the 2nd law of thermodynamics state?

Energy is the ability to bring about change or to do work. … The Second Law of Thermodynamics states that “in all energy exchanges, if no energy enters or leaves the system, the potential energy of the state will always be less than that of the initial state.” This is also commonly referred to as entropy.

## Which best expresses the first law of thermodynamics?

The first law of thermodynamics states that the change in internal energy of a system equals the net heat transfer into the system minus the net work done by the system. In equation form, the first law of thermodynamics is ΔU = Q − W.

## Is the first law of thermodynamics always true?

How can the first law is constantly observed to be true and we call it a scientific law yet we can’t say the equation behind it is true. … The First Law of Thermodynamics, the equation(s) describing the conservation of energy, is “true” in the sense that it is very dependable.

## Why is the 2nd Law of Thermodynamics important?

Second law of thermodynamics is very important because it talks about entropy and as we have discussed, ‘entropy dictates whether or not a process or a reaction is going to be spontaneous’.