Enthalpy
Enthalpy is the sum of a thermodynamic system's internal energy and the product of its pressure and volume.
At a glance
Key signals
0% cross fields · reaches 1 more
- Chemistry
- Physical Chemistry
- Explanation
- Examples
- Misconception
- Sourced relations 3
- Attribution
Dependencies
What this concept builds on and what it makes possible — derived from the atlas’s dependency, causal and structural relations, not from every related edge.
Enables · leads to
Gibbs free energydepends onEnthalpyEstablished
Gibbs free energy depends on enthalpy.
Mechanism: Gibbs free energy depends on enthalpy: it combines the heat change with the entropy change to predict whether a reaction runs spontaneously.
- Chemistry 2e (OpenStax) (2019) verifiedmoderate evidence
System context
Enthalpyis part ofChemical thermodynamicsEstablished
Open Chemical thermodynamics →
enthalpy is part of chemical thermodynamics.
Mechanism: Enthalpy is a key quantity of chemical thermodynamics: the heat content of a system, whose change tells us if a reaction gives off or takes in heat.
- Chemistry 2e (OpenStax) (2019) verifiedmoderate evidence
Structural role & consequence
Interpreted from the current atlas graph — what the connections mean, not just how many there are.
Currently dark in the atlas: no key date stored · 3 of 3 of its relations lack claim-level evidence.
atlas representation · Describes the current Thinking OS representation, not the state of the world.
Structural neighbourhood: 3 → 9 → 32 concepts reachable within 3 hops.
structural · Structural reach — being reachable is not the same as being understood.
All 3 of its relationships stay within its own discipline — a field-specific concept in the current atlas.
structural · Structural graph analysis — not a claim of importance, causation or history.
cross-field
3 within-field, 0 cross-field
Strengths & constraints
Constraints
- Evidence coverage currently thin in the atlas — few of its relationships carry claim-level evidence. atlas representation
- No dated history stored — the atlas records no key date for this concept. atlas representation
Conditions
- Read structurally — most of its relationships carry no external evidence yet, so claims here are graph-derived. structural
Dependency radial
What this concept builds on (left) and what it makes possible (right) — derived from dependency and causal relations.
What builds on this
1 concept build on this directly, 1 in total, across 2 disciplines.
Structural downstream reach along dependency edges — not a claim of historical necessity.
Seen through each discipline
How this concept sits in each of its fields — derived from its real connections in the graph, not asserted.
Through this lens it connects to Chemical thermodynamics, Exothermic reaction and Gibbs free energy.
Through this lens it connects to Chemical thermodynamics and Gibbs free energy.
Formula
Total heat content of a system at constant pressure.
U— internal energyP— pressureV— volume
Source: Chemistry 2e (OpenStax)
Related ideas to explore
Concepts that look related but are not yet connected here — candidates for a connection to reason about, not established links.
This idea also appears in…
The same structure shows up in other disciplines. These are real recurrences drawn from the graph — a starting point for asking “what carries over, and what changes?”
Energy transformation35 disciplines · 49 concepts
Concepts
shares a mental model
shares a mental model
shares a mental model
shares a mental model
shares a mental model
shares a mental model
Mental models at work here
- Connects 3 other ideas across 2 disciplines.
- Most of its connections are of the “Kind & structure” kind.
- It exercises 1 reusable thinking pattern.
Derived from the graph’s real structure — observations, not a score.
Sources
- Wikipedia (English & German editions) verifiedmoderate evidence
- Wikidata verifiedmoderate evidence
- Chemistry 2e (OpenStax) (2019) verifiedmoderate evidence