Carnot cycle
E531749
The Carnot cycle is an idealized thermodynamic cycle that defines the maximum possible efficiency any heat engine can achieve when operating between two temperature reservoirs.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Carnot cycle canonical | 5 |
| Carnot heat engine | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5496853 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Carnot cycle Context triple: [Sadi Carnot, notableConcept, Carnot cycle]
-
A.
Brayton cycle
The Brayton cycle is a thermodynamic cycle commonly used in gas turbine engines, where air is compressed, mixed with fuel and combusted, and then expanded through a turbine to produce work.
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B.
Carnot efficiency
Carnot efficiency is the theoretical maximum efficiency that any heat engine can achieve when operating between two temperatures, serving as a fundamental limit in thermodynamics.
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C.
Carnot
Carnot is a French surname most famously associated with mathematician and physicist Sadi Carnot, a founder of thermodynamics, and several prominent political and military figures in France.
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D.
Clausius theorem
The Clausius theorem is a fundamental result in thermodynamics that formalizes the second law by relating the cyclic integral of heat transfer over temperature to entropy, showing that this quantity is always less than or equal to zero for any cyclic process.
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E.
Kelvin–Planck statement of the second law of thermodynamics
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.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Carnot cycle Target entity description: The Carnot cycle is an idealized thermodynamic cycle that defines the maximum possible efficiency any heat engine can achieve when operating between two temperature reservoirs.
-
A.
Brayton cycle
The Brayton cycle is a thermodynamic cycle commonly used in gas turbine engines, where air is compressed, mixed with fuel and combusted, and then expanded through a turbine to produce work.
-
B.
Carnot efficiency
Carnot efficiency is the theoretical maximum efficiency that any heat engine can achieve when operating between two temperatures, serving as a fundamental limit in thermodynamics.
-
C.
Carnot
Carnot is a French surname most famously associated with mathematician and physicist Sadi Carnot, a founder of thermodynamics, and several prominent political and military figures in France.
-
D.
Clausius theorem
The Clausius theorem is a fundamental result in thermodynamics that formalizes the second law by relating the cyclic integral of heat transfer over temperature to entropy, showing that this quantity is always less than or equal to zero for any cyclic process.
-
E.
Kelvin–Planck statement of the second law of thermodynamics
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.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
idealized heat engine cycle
ⓘ
thermodynamic cycle ⓘ |
| assumes |
no friction
ⓘ
no heat losses other than to reservoirs ⓘ quasi-static processes ⓘ reversible processes ⓘ |
| category |
heat engine cycles
ⓘ
ideal thermodynamic cycles ⓘ |
| comparedWith | real heat engine cycles ⓘ |
| consistsOf |
adiabatic compression
ⓘ
adiabatic expansion ⓘ isothermal compression ⓘ isothermal expansion ⓘ |
| defines | maximum possible efficiency of a heat engine between two temperature reservoirs ⓘ |
| efficiencyDependsOn |
temperature of cold reservoir
ⓘ
temperature of hot reservoir ⓘ |
| hasAssumption |
reservoirs have constant temperature
ⓘ
working fluid returns to initial state after cycle ⓘ |
| hasEfficiencyFormula | 1 - Tc/Th ⓘ |
| hasKeyConcept |
entropy change
ⓘ
reversibility ⓘ thermal efficiency ⓘ |
| hasProcessType |
reversible adiabatic compression
ⓘ
reversible adiabatic expansion ⓘ reversible isothermal heat addition ⓘ reversible isothermal heat rejection ⓘ |
| hasProperty |
net work output per cycle
ⓘ
zero total entropy change for system plus reservoirs in ideal case ⓘ |
| hasWorkingSubstance | ideal gas ⓘ |
| implies | no engine can be more efficient than a Carnot engine between same reservoirs ⓘ |
| introducedBy | Sadi Carnot NERFINISHED ⓘ |
| introducedInWork | Reflections on the Motive Power of Fire NERFINISHED ⓘ |
| namedAfter | Sadi Carnot NERFINISHED ⓘ |
| obeys |
first law of thermodynamics
ⓘ
second law of thermodynamics ⓘ |
| operatesBetween |
cold reservoir
ⓘ
hot reservoir ⓘ |
| relatedTo |
Carnot theorem
NERFINISHED
ⓘ
Clausius inequality NERFINISHED ⓘ Kelvin-Planck statement of the second law NERFINISHED ⓘ |
| representedOnDiagram |
P-V diagram
ⓘ
T-S diagram ⓘ |
| represents | upper limit of heat engine efficiency ⓘ |
| usedIn |
heat engine theory
ⓘ
statistical mechanics education ⓘ thermodynamics ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Carnot cycle Description of subject: The Carnot cycle is an idealized thermodynamic cycle that defines the maximum possible efficiency any heat engine can achieve when operating between two temperature reservoirs.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Sadi Carnot
this entity surface form:
Carnot heat engine