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Hydrogen: History, Applications & Standards

Hydrogen is a chemical element; it has the symbol H and atomic number 1. It is the lightest and most abundant chemical element in the universe, constituting about 75% of all normal matter. Under standard conditions, hydrogen is a gas of diatomic molecules with the formula H2, called dihydrogen, or sometimes hydrogen gas, molecular hydrogen, or simply…

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Hydrogen topic overview

The analysis highlights History, Applications and Standards as prominent areas in the source structure around Hydrogen.

Related topics
419
Source areas
7
Connected nodes
426
Extracted relationships
266
Concept neighborhoods
103
Bridge connections
426

What this topic covers Research coverage

Source areas are shown by the number of related topics found in each part of the analysis. Use smaller areas too: they can reveal specialized angles and content gaps.

Overview · 229 topics
Applications · 65 topics
Chemistry · 39 topics
History · 37 topics
Occurrence · 25 topics
Production and storage · 21 topics
Safety and precautions · 3 topics

Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.

Key facts & relationships

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

1H
99.9855%
2H
0.0115%
3H
trace
Appearance
Colorless gas
Atomic number (Z)
1
Block
s-block

Explore all related topics Closing gaps

Browse the complete topic structure, not only the most central items. Less prominent entities and concepts can reveal missing angles, specialized context and useful research gaps. Each item opens a new analysis centered on that subject.

Overview

History

Chemistry

Occurrence

Production and storage

Applications

Safety and precautions

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.

How Hydrogen connects Entity context

The extracted context around Hydrogen shows recurring relationship patterns in the source. For example, Hydrogen → Cambridge, Chart, Climate, David, Eric, Fact, Fiction, Franklin Watts, Harvard University Press, ISBN, Island Press, Its Significance, Its Story, John, Joseph, Knolls Atomic Power Laboratory, Massachusetts, New York, Newton, Nuclides Another extracted example is Hydrogen → Basic, Berkeley, Burkhard Militzer, California, Drexel University, Georgia State University, High, HyperPhysics, Nottingham, The Periodic Table, Timothy Jones, University, Videos, Wavefunction, Wayback Machine. Use these groups to spot repeated connection types before inspecting the individual relationships.

Hydrogen

Top relations

related to Further reading · 30
Hydrogen → Cambridge, Chart, Climate, David, Eric, Fact, Fiction, Franklin Watts, Harvard University Press, ISBN, Island Press, Its Significance, Its Story, John, Joseph, Knolls Atomic Power Laboratory, Massachusetts, New York, Newton, Nuclides
related to External links · 15
Hydrogen → Basic, Berkeley, Burkhard Militzer, California, Drexel University, Georgia State University, High, HyperPhysics, Nottingham, The Periodic Table, Timothy Jones, University, Videos, Wavefunction, Wayback Machine
related to 19th century · 13
Hydrogen → According, By, Diatomic, Edward Daniel Clarke, François Isaac, H2, He, James Clerk Maxwell's, James Dewar, One, Rivaz, The Döbereiner's, These
related to Niche and evolving uses · 13
Hydrogen → Applications, Beyond, Coolant, Cryogenic, Dayton, E949, Food, Leak, Liquid H2, Ohio, Pure, Shielding, The
related to 20th century · 12
Hydrogen → Because, Bohr, Due, Earth, Gilbert, However, In, Lewis, LiH, Moers, Sun, The
related to Protons and acids · 12
Hydrogen → Brønsted, Even, H3O, H9O4, In, Lower, Lowry, Other, Otherwise, The, To, Under
related to Storage · 12
Hydrogen → BH3, For, H2, H2-equivalents, H3N, If H2, In, It, Liquefaction, More, The, These
related to Terrestrial · 10
Hydrogen → As, Australia, Despite, Earth's, Elemental, France, H2, It, Large, Mali
see also · 10
Hydrogen → Chemistry, Combined, EarthPyrolysis, Industrial, Molecular, Natural, Procedures, Technologies, Thermal, Using
related to Reactions of H2 · 9
Hydrogen → According, Although, Earth, H2, It, The, The H-H, These, They

Important terminology

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

Important terminology

gas h2 water used also compounds production produced energy proton form carbon reaction deuterium fuel molecules electron metals temperature low

Hydrogen relationships Subject–Predicate–Object triples

TTTA extracted 266 structured relationships around Hydrogen. Examples in this analysis include Hydrogen → 1H → 99.9855% and Hydrogen → 2H → 0.0115%. The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
Hydrogen1H99.9855%1.00infobox
Hydrogen2H0.0115%1.00infobox
Hydrogen3Htrace1.00infobox
HydrogenAppearanceColorless gas1.00infobox
HydrogenAtomic number (Z)11.00infobox
HydrogenBlocks-block1.00infobox
HydrogenBoiling point(H2) 20.271 K ​(−252.879 °C, ​−423.182 °F)1.00infobox
HydrogenCAS Number12385-13-6 1333-74-0 (H2)1.00infobox
HydrogenCovalent radius31±5 pm1.00infobox
HydrogenCritical point32.938 K, 1.2858 MPa1.00infobox
HydrogenCrystal structure​hexagonal (hP4)1.00infobox
HydrogenDensity (at STP)0.08988 g/L1.00infobox
HydrogenDiscovery and first isolationHenry Cavendish (1766)1.00infobox
HydrogenElectron configuration1s11.00infobox
HydrogenElectronegativityPauling scale: 2.201.00infobox
HydrogenElectrons per shell11.00infobox
HydrogenGroupgroup 1: hydrogen and alkali metals1.00infobox
HydrogenHeat of fusion(H2) 0.117 kJ/mol1.00infobox
HydrogenHeat of vaporization(H2) 0.904 kJ/mol1.00infobox
HydrogenIonization energies1st: 1312.0 kJ/mol1.00infobox
HydrogenLattice constantsa = 378.97 pm c = 618.31 pm (at triple point)1.00infobox
HydrogenMagnetic orderingdiamagnetic1.00infobox
HydrogenMain isotopes.mw-parser-output .isotopes-table{text-align:center;width:100%;border-collapse:collapse;margin:0;padding:0}.mw-parser-output .isotopes-table-headers>:not(:first-child){padding:0…1.00infobox
HydrogenMelting point(.mw-parser-output .template-chem2-su{display:inline-block;font-size:80%;line-height:1;vertical-align:-0.35em}.mw-parser-output .template-chem2-su>span{display:block;text-align:…1.00infobox
HydrogenMolar heat capacity14.418 J/(mol·K) (H) 28.836 J/(mol·K) (H2)1.00infobox
HydrogenMolar magnetic susceptibility−3.98×10−6 cm3/mol (298 K)1.00infobox
HydrogenNamed byAntoine Lavoisier (1783)1.00infobox
HydrogenNamingname means 'water-former' in Greek1.00infobox
HydrogenNatural occurrenceprimordial1.00infobox
HydrogenOxidation statescommon: −1, +11.00infobox

Related concept clusters Concept neighborhoods

The concept neighborhoods around Hydrogen bring nearby vocabulary together. In this analysis, examples include Water, Produced and H2. Use the clusters to find adjacent concepts and terminology that may deserve separate research.

  • Hydrogen
    • Water
    • Produced
    • H2
    • Production
    • Used
    • Carbon
    • Reaction
    • Compounds
    • Energy
    • Form
    • Heat
    • Fuel
  • hydrogen
    • Water
    • Produced
    • H2
    • Production
    • Used
    • Carbon
    • Reaction
    • Compounds
    • Energy
    • Form
    • Heat
    • Fuel
  • chemical element
    • Element
    • Hydrocarbons
    • Used
    • Deuterium
    • Compounds
    • Water
    • Also
    • Iron
    • Electron
    • Isotope
    • Heat
    • Known
  • gas
    • Hydrogen
    • H2
    • Water
    • Reaction
    • Produced
    • Production
    • Dihydrogen
    • Also
    • Heat
    • First
    • Used
    • Carbon
  • water
    • Electrolysis
    • Compounds
    • Many
    • Hydrogen
    • Gas
    • Produced
    • Hydrocarbons
    • Iron
    • H2
    • Reaction
    • Also
    • Methane
  • organic compounds
    • Hydrocarbons
    • Known
    • Water
    • Deuterium
    • Dihydrogen
    • Hydride
    • Electron
    • Element
    • Hydrogen
    • H2
    • Carbon
    • Used
  • isotope of hydrogen
    • Proton
    • Deuterium
    • Water
    • Electron
    • Produced
    • H2
    • Production
    • Used
    • Carbon
    • Reaction
    • Compounds
    • Energy
  • hydrogen spectral series
    • Water
    • Produced
    • H2
    • Production
    • Used
    • Carbon
    • Reaction
    • Compounds
    • Energy
    • Form
    • Heat
    • Fuel

Connections between topic areas Semantic bridges

For Hydrogen, one of the stronger structural bridges in this analysis connects Hydrogen with Overview. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.

Min side: 3
HydrogenOverview · splits 197 ⟂ 230
HydrogenApplications · splits 361 ⟂ 66
HydrogenChemistry · splits 387 ⟂ 40
HydrogenHistory · splits 389 ⟂ 38
HydrogenOccurrence · splits 401 ⟂ 26
HydrogenProduction and storage · splits 405 ⟂ 22
HydrogenSafety and precautions · splits 423 ⟂ 4

Map overview Semantic statistics

Hydrogen

Nodes427
Edges426
Triples266
Avg. degree2
Density0.004684
Components1

Source & methodology

TTTA analyzes the structure around Hydrogen to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as History, Applications & Standards, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.

Source: Wikipedia — Hydrogen · EN edition · Analysis: TopicsToTalkAbout

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