First law of thermodynamics

For a simple compressible system with fixed particle number,

d E = T d S - p d V

.

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- Adiabatic process First law of thermodynamics

Adiabatic process

An adiabatic process exchanges no heat with its surroundings, so

δ Q = 0

. A reversible adiabatic process is isentropic.

Adiabatic compression

Adiabatic expansion

Isentropic process

An isentropic process keeps the entropy constant. Every reversible adiabatic process is isentropic, while an irreversible adiabatic process can increase entropy.

Reversible ideal-gas adiabat

For a fixed amount of ideal gas with constant heat capacities, the first law and

δ Q = 0

give

T V^{γ - 1} = constant, p V^{γ} = constant,

where

γ = C_{p} / C_{V}

.

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First law of thermodynamics by

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The First Law of Thermodynamics, also known as the law of energy conservation, states that energy cannot be created or destroyed in an isolated system. Instead, energy can only be transformed from one form to another or transferred between systems.

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