Helmholtz free energy

E1010551

Helmholtz free energy is a thermodynamic potential that measures the useful work obtainable from a closed system at constant temperature and volume.

All labels observed (3)

Label Occurrences
Helmholtz free energy canonical 2
Helmholtz energy 1
Helmholtz function 1

How this entity was disambiguated

Statements (48)

Predicate Object
instanceOf state function ⓘ
thermodynamic potential ⓘ
alsoKnownAs Helmholtz energy ⓘ
Helmholtz function ⓘ
appliesTo closed systems ⓘ
systems in contact with a heat bath at fixed temperature ⓘ
conditionForSpontaneity process at constant T and V is spontaneous if ΔF < 0 ⓘ
conjugateTo chemical potential via particle number ⓘ
pressure via volume ⓘ
definedByEquation F = U - T S ⓘ
dependsOn canonical partition function ⓘ
entropy ⓘ
internal energy ⓘ
temperature ⓘ
dimension energy ⓘ
ensemble canonical ensemble ⓘ
equilibriumCondition ΔF = 0 at equilibrium for reversible processes at constant T and V ⓘ
extensiveOrIntensive extensive quantity ⓘ
LegendreTransformOf internal energy with respect to entropy ⓘ
mathematicalProperty is a function of state variables T, V, N ⓘ
minimumPrinciple equilibrium at constant T and V corresponds to minimum Helmholtz free energy ⓘ
namedAfter Hermann von Helmholtz ⓘ
naturalVariable particle number ⓘ
temperature ⓘ
volume ⓘ
perMoleForm molar Helmholtz free energy ⓘ
perParticleForm f = F/N ⓘ
physicalMeaning maximum useful work obtainable from a closed system at constant temperature and volume ⓘ
relatedTo Gibbs free energy ⓘ
enthalpy ⓘ
grand potential ⓘ
internal energy ⓘ
SIBaseUnits kg·m^2·s^-2 ⓘ
statisticalMechanicsExpression F = -k_B T ln Z ⓘ
symbol A ⓘ
F ⓘ
thermodynamicDifferential dF = -S dT - p dV + μ dN (for single component system) ⓘ
unit joule ⓘ
useCondition constant temperature ⓘ
constant volume ⓘ
usedIn chemical thermodynamics ⓘ
condensed matter physics ⓘ
statistical mechanics ⓘ
thermodynamics ⓘ
usedToDerive compressibility ⓘ
equations of state ⓘ
response functions such as heat capacities ⓘ
thermal expansion coefficient ⓘ

How these facts were elicited

Referenced by (4)

Full triples — surface form annotated when it differs from this entity's canonical label.

Gibbs free energy → relatedTo → Helmholtz free energy ⓘ
Callen formulation of thermodynamics → usesConcept → Helmholtz free energy ⓘ
Helmholtz free energy → alsoKnownAs → Helmholtz energy ⓘ
linked to: Helmholtz free energy
Helmholtz free energy → alsoKnownAs → Helmholtz function ⓘ
linked to: Helmholtz free energy