# Definitions for first law of thermodynamicsfirst law of ther·mo·dy·nam·ics

### Princeton's WordNetRate this definition:0.0 / 0 votes

1. conservation of energy, law of conservation of energy, first law of thermodynamicsnoun

the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes

### WikipediaRate this definition:0.0 / 0 votes

1. First law of thermodynamics

The First Law of thermodynamics is a formulation of the law of conservation of energy, adapted for thermodynamic processes. A simple formulation is: "the total energy in a system remains constant, although it may be converted from one form to another." Another common phrasing is that "energy can neither be created nor destroyed" (in a "closed system"). While there are many subtleties and implications, which may be better captured in more complex formulations, this is the essential principle of the First Law. It distinguishes in principle two forms of energy transfer, heat and thermodynamic work for a system of a constant amount of matter. The law also defines the internal energy of a system, an extensive property for taking account of the balance of energies in the system. The law of conservation of energy states that the total energy of any isolated system, which cannot exchange energy or matter, is constant. Energy can be transformed from one form to another, but can be neither created nor destroyed. The first law for a thermodynamic process is often formulated as Δ U = Q − W {\displaystyle \Delta U=Q-W} ,where Δ U {\displaystyle \Delta U} denotes the change in the internal energy of a closed system (for which heat or work through the system boundary are possible, but matter transfer is not possible), Q {\displaystyle Q} denotes the quantity of energy supplied to the system as heat, and W {\displaystyle W} denotes the amount of thermodynamic work done by the system on its surroundings. An equivalent statement is that perpetual motion machines of the first kind are impossible; work W {\displaystyle W} done by a system on its surroundings requires that the system's internal energy U {\displaystyle U} decrease or be consumed, so that the amount of internal energy lost by that work must be resupplied as heat Q {\displaystyle Q} by an external energy source or as work by an external machine acting on the system (so that U {\displaystyle U} is recovered) to make the system work continuously. The ideal isolated system, of which the entire universe is an example, is often only used as a model. Many systems in practical applications require the consideration of internal chemical or nuclear reactions, as well as transfers of matter into or out of the system. For such considerations, thermodynamics also defines the concept of open systems, closed systems, and other types.

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1. first law of thermodynamics

The first law of thermodynamics, also known as the Law of Conservation of Energy, states that energy cannot be created or destroyed in an isolated system. It can only be transferred or changed from one form to another. The total amount of energy remains constant.

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1. First law of thermodynamics

The first law of thermodynamics is a version of the law of conservation of energy, adapted for thermodynamic systems. The internal energy of an isolated system is constant and energy can be transformed from one form to another, but cannot be created or destroyed. The first law is often formulated by stating that the change in the internal energy of a closed system is equal to the amount of heat supplied to the system, minus the amount of work done by the system on its surroundings.

### Numerology

1. Chaldean Numerology

The numerical value of first law of thermodynamics in Chaldean Numerology is: 2

2. Pythagorean Numerology

The numerical value of first law of thermodynamics in Pythagorean Numerology is: 8

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