Research any topic before you write.

Find related topics. | Discover entities. | See connections. | Build a topical map.

Enthalpy

Enthalpy (/ˈɛnθəlpi/ ⓘ) is the sum of a thermodynamic system's internal energy and the product of its pressure and volume. It is a state function in thermodynamics used in many measurements in chemical, biological, and physical systems at a constant external pressure, which is conveniently provided by Earth's ambient atmosphere. The pressure–volume term…

History, Applications, Measurement & Art

Use the mouse wheel or two fingers (on touchscreens) to zoom in and out of the map.

Research this topic

Explore the main themes, entities and connections around Enthalpy. Start with the topic map, then use the sections below for research and deeper semantic analysis.

Explore this topic

Start with a few of the strongest sections from the source topic. These are research directions, not a list of keywords you must use.

Key facts & relationships

High-confidence facts extracted from structured source data. Use them as anchors for further research.

Common symbols
H
In SI base units
kg⋅m2⋅s−2
SI unit
joule

Topics to explore

Browse the full topic structure. Each item opens a new analysis centered on that subject.

Overview

Definition

Other expressions

Physical interpretation

Relationship to heat

Applications

Diagrams

History and etymology

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

Map overview Semantic statistics

Enthalpy

Nodes117
Edges116
Triples103
Avg. degree1.98
Density0.017094
Components1

How this topic connects Entity context

See the strongest relationship patterns around the current topic before diving into the raw triples.

Enthalpy

Top relations

related to External links · 12
Enthalpy → Archived, Astronomy Department, Chemistry Department, Eric, Eric Weisstein's World, Georgia State University, October, Physics, Texas, Thermodynamics, University, Weisstein
is a · 9
Enthalpy → extensive parameter, extensive property, heat received by the system.For a simple system with a constant number of particles at constant pressure, joule, preferred expression for measurements at constant pressure, so-called throttling process, stand-in for energy in chemical systems, state function.Enthalpies of chemical substances are usually listed for 1 bar, sum of the enthalpies of the component subsystems
related to Relationship to heat · 9
Enthalpy → Cases, If, In, Joule, Now, Q-p, This, V-p, We
related to Characteristic functions and natural state variables · 8
Enthalpy → As, Conjugate, For, It, Ni, The, They, This
related to Enthalpy changes · 7
Enthalpy → An, Chemistry, CRC Handbook, It, Physics, The, These
related to history · 7
Enthalpy → Energy, Entropy, Gibbs, Greek, Rudolf Clausius, The, Thomas Young
related to Throttling · 7
Enthalpy → For, Hence, It, Joule, One, This, Thomson
related to Definition · 6
Enthalpy → As, For, H/m, H/n, Hm, The
related to Diagrams · 6
Enthalpy → It, One, Practically, The, There, These
has application · 5
Enthalpy → Energy, For, In, The, Together

Important terminology Word statistics

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

system pressure energy change heat displaystyle constant state thermodynamic temperature work volume mathrm one chemical defined systems pv term internal

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
EnthalpyCommon symbolsH1.00infobox
EnthalpyIn SI base unitskg⋅m2⋅s−21.00infobox
EnthalpySI unitjoule1.00infobox
Enthalpyis astand-in for energy in chemical systems0.90text
Enthalpyis ajoule0.90text
Enthalpyis apreferred expression for measurements at constant pressure0.90text
Enthalpyis astate function.Enthalpies of chemical substances are usually listed for 1 bar0.90text
Enthalpyis aextensive property0.90text
Enthalpyis asum of the enthalpies of the component subsystems0.90text
Enthalpyis aheat received by the system.For a simple system with a constant number of particles at constant pressure0.90text
Enthalpyis aso-called throttling process0.90text
Enthalpyis aextensive parameter0.90text

Related concept clusters Concept neighborhoods

These clusters group vocabulary that occurs around closely connected concepts in the source material.

    Connections between topic areas Semantic bridges

    Bridges can reveal useful research angles that are easy to miss in a flat list of related terms.

    Min side: 3
    For writers, content strategists, SEOs, marketers and creators — from quick topic research to advanced semantic analysis.