Kelvin–Planck statement of the second law of thermodynamics

E247922

The Kelvin–Planck statement of the second law of thermodynamics asserts that it is impossible to construct a cyclic heat engine that converts all absorbed heat from a single reservoir entirely into work without any other effect.

All labels observed (3)

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Statements (43)

Predicate Object
instanceOf formulation of the second law of thermodynamics ⓘ
thermodynamic law statement ⓘ
appliesTo cyclic heat engines ⓘ
macroscopic thermodynamic systems ⓘ
assumes cyclic operation of the engine ⓘ
existence of a thermal reservoir at constant temperature ⓘ
category physical law ⓘ
clarifiedBy statistical mechanics interpretation of entropy ⓘ
constrains maximum efficiency of heat engines ⓘ
describes impossibility of perfect heat-to-work conversion in a cyclic engine ⓘ
limitations of heat engine efficiency ⓘ
equivalentTo Clausius statement of the second law of thermodynamics under suitable assumptions ⓘ
field statistical mechanics ⓘ
thermodynamics ⓘ
forbids cyclic device that converts heat from a single reservoir completely into work ⓘ
perpetual motion machine of the second kind ⓘ
hasConsequence heat engines must exchange heat with at least two reservoirs to produce work ⓘ
no reversible engine can exceed the efficiency of a Carnot engine operating between the same two temperatures ⓘ
historicalPeriod 19th century physics ⓘ
implies directionality of natural thermodynamic processes ⓘ
existence of waste heat in real heat engines ⓘ
impossibility of 100 percent efficient heat engines ⓘ
involvesConcept cyclic process ⓘ
entropy ⓘ
heat reservoir ⓘ
thermal efficiency ⓘ
work ⓘ
logicalForm impossibility statement ⓘ
namedAfter Max Planck ⓘ
Lord Kelvin ⓘ
surface form: William Thomson, 1st Baron Kelvin
partOf second law of thermodynamics ⓘ
relatedTo Carnot cycle ⓘ
surface form: Carnot heat engine

Carnot efficiency ⓘ
surface form: Carnot theorem

Clausius statement of the second law of thermodynamics ⓘ
perpetual motion machine of the second kind ⓘ
states a cyclic heat engine must reject some heat to a lower-temperature reservoir if it produces work ⓘ
no heat engine operating in a cycle can convert all the heat absorbed from a single reservoir into work ⓘ
supports definition of thermodynamic temperature scale ⓘ
taughtIn graduate statistical physics courses ⓘ
undergraduate thermodynamics courses ⓘ
usedIn design and analysis of power cycles ⓘ
engineering thermodynamics ⓘ
formulation of entropy increase principle ⓘ

How these facts were elicited

Referenced by (4)

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

Lord Kelvin → knownFor → Kelvin–Planck statement of the second law of thermodynamics ⓘ
Carathéodory’s formulation of the second law of thermodynamics → relatesTo → Kelvin–Planck statement of the second law of thermodynamics ⓘ
this entity surface form: Kelvin–Planck formulation of the second law
Clausius statement of the second law of thermodynamics → relatedTo → Kelvin–Planck statement of the second law of thermodynamics ⓘ
Clausius statement of the second law of thermodynamics → equivalentTo → Kelvin–Planck statement of the second law of thermodynamics ⓘ
this entity surface form: Kelvin–Planck statement of the second law of thermodynamics under suitable assumptions