second law of thermodynamics
E700593
The second law of thermodynamics is a fundamental physical principle stating that the total entropy of an isolated system can never decrease over time, establishing the direction of natural processes and the concept of irreversibility.
All labels observed (2)
| Label | Occurrences |
|---|---|
| second law of thermodynamics canonical | 2 |
| Second Law of Thermodynamics | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7903631 — 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: second law of thermodynamics Context triple: [third law of thermodynamics, contrastsWith, second law of thermodynamics]
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A.
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.
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B.
Clausius statement of the second law of thermodynamics
The Clausius statement of the second law of thermodynamics asserts that heat cannot spontaneously flow from a colder body to a hotter body without external work being performed.
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C.
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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D.
Carathéodory’s formulation of the second law of thermodynamics
Carathéodory’s formulation of the second law of thermodynamics is a mathematically rigorous restatement of the second law based on the inaccessibility of certain thermodynamic states, providing a foundation for the concept of entropy without relying on cyclic processes or heat engines.
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E.
third law of thermodynamics
The third law of thermodynamics is a fundamental principle stating that the entropy of a perfect crystal approaches zero as its temperature approaches absolute zero, forming a basis for absolute entropy measurements and low-temperature physics.
- 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: second law of thermodynamics Target entity description: The second law of thermodynamics is a fundamental physical principle stating that the total entropy of an isolated system can never decrease over time, establishing the direction of natural processes and the concept of irreversibility.
-
A.
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.
-
B.
Clausius statement of the second law of thermodynamics
The Clausius statement of the second law of thermodynamics asserts that heat cannot spontaneously flow from a colder body to a hotter body without external work being performed.
-
C.
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.
-
D.
Carathéodory’s formulation of the second law of thermodynamics
Carathéodory’s formulation of the second law of thermodynamics is a mathematically rigorous restatement of the second law based on the inaccessibility of certain thermodynamic states, providing a foundation for the concept of entropy without relying on cyclic processes or heat engines.
-
E.
third law of thermodynamics
The third law of thermodynamics is a fundamental principle stating that the entropy of a perfect crystal approaches zero as its temperature approaches absolute zero, forming a basis for absolute entropy measurements and low-temperature physics.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
law of thermodynamics
ⓘ
physical law ⓘ |
| alsoKnownAs | law of entropy increase ⓘ |
| appliesTo | macroscopic systems ⓘ |
| ClausiusStatement | heat cannot spontaneously flow from a colder body to a hotter body ⓘ |
| concerns |
entropy
ⓘ
irreversibility ⓘ isolated systems ⓘ spontaneous processes ⓘ |
| constrains |
direction of chemical reactions in isolated systems
ⓘ
possible thermodynamic processes ⓘ |
| describes | entropy increase in isolated systems ⓘ |
| entropyStatement | the entropy of an isolated system tends to increase and approaches a maximum ⓘ |
| field |
physics
ⓘ
thermodynamics ⓘ |
| formulation |
Clausius statement
ⓘ
Kelvin–Planck statement ⓘ entropy statement ⓘ statistical mechanics formulation ⓘ |
| foundationFor |
concept of free energy in spontaneous processes
ⓘ
non-equilibrium thermodynamics ⓘ thermodynamic definition of temperature ⓘ |
| historicallyDevelopedBy |
Ludwig Boltzmann
ⓘ
Rudolf Clausius ⓘ William Thomson, 1st Baron Kelvin ⓘ
linked to:
Lord Kelvin
|
| implies |
Carnot efficiency is the maximum efficiency of a heat engine operating between two temperatures
ⓘ
linked to:
Carnot efficiency
efficiency limits for heat engines ⓘ existence of a preferred direction of time ⓘ heat flows spontaneously from hot to cold ⓘ natural processes are irreversible ⓘ perpetual motion machines of the second kind are impossible ⓘ there is a thermodynamic arrow of time ⓘ |
| KelvinPlanckStatement | it is impossible to construct a cyclic engine whose sole effect is to convert heat from a single reservoir completely into work ⓘ |
| mathematicalForm | dS ≥ δQ_rev / T for closed systems ⓘ |
| predicts | entropy production in irreversible processes ⓘ |
| relatedConcept |
Boltzmann entropy
ⓘ
entropy ⓘ heat death of the universe ⓘ microstates and macrostates ⓘ thermodynamic equilibrium ⓘ |
| states | the total entropy of an isolated system never decreases over time ⓘ |
| statisticalNature | it is overwhelmingly probable rather than absolutely unavoidable ⓘ |
| timePeriodOfDevelopment | 19th century ⓘ |
| usedIn |
design of heat engines
ⓘ
information theory analogies ⓘ refrigeration cycles ⓘ statistical mechanics ⓘ |
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: second law of thermodynamics Description of subject: The second law of thermodynamics is a fundamental physical principle stating that the total entropy of an isolated system can never decrease over time, establishing the direction of natural processes and the concept of irreversibility.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: second law of thermodynamics