Research any topic before you write.

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

Helium-3

Helium-3 (3He) is a light, stable isotope of helium with two protons and one neutron in a nucleus called helion. It is in contrast to the more common isotope, helium-4, which has two protons and two neutrons. Helium-3 and hydrogen-1 are the only stable nuclides with more protons than neutrons. It was discovered in 1939. Helium-3 atoms are fermionic and…

History, Applications, Measurement & Standards

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 Helium-3. 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.

Half-life (t1/2)
stable
Isotope mass
3.016029322 Da
Names
helium-3, tralphium (obsolete)
Natural abundance
0.000137% (atmosphere) 0.01% (Solar System)
Neutrons (N)
1
Parent isotopes
3H (beta decay of tritium)

Topics to explore

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

Overview

History

Physical properties

Natural abundance

Human production

Uses

Notes and references

  • Bibcode Bibcode (identifier)
  • Doi Doi (identifier)
  • ISBN ISBN (identifier)

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

Helium-3

Nodes205
Edges204
Triples159
Avg. degree1.99
Density0.009756
Components1

How this topic connects Entity context

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

Helium-3

Top relations

related to Bibliography · 44
Helium-3 → American Institute, Archived, August, Bibcode, Challenges, Daunt, Dobbs, Energy, Enterprise, Exotic, Exploration, Fusion Power, Goodwin, Halperin, Helium, Human Settlement, ISBN, July, Liquid, Moon
related to Superfluidity · 29
Helium-3 → A-phase, Alexei Abrikosov, An, At, B-phase, B-phases, BCS, Bose, Cooper, David Lee, Douglas Osheroff, During, Each Cooper, Einstein, Excited, In, Many, Nobel Prize, Physics, Robert Coleman Richardson
related to Moon · 10
Helium-3 → Because, Chandrayaan-1, Gerald Kulcinski, Indian Space Research Organisation's, Materials, Moon, Moon's, No, October, The
related to history · 9
Helium-3 → Australian, Cambridge Cavendish Laboratory, Isolation, Luis Alvarez, Mark Oliphant, Oliphant, Robert Cornog, The, University
related to Nuclear magnetic resonance · 9
Helium-3 → Because, During, In, It, NMR, NMR-active, Nuclear, The, This
related to Tritium decay · 7
Helium-3 → DOE, DOE Isotope Program, Energy, Production, United States, US Department, Virtually
related to External links · 6
Helium-3 → Archived, BBC Horizon, Physics, Sale, The Nobel Prize, Wayback MachineMoon
related to Physical properties · 6
Helium-3 → Also, Da, Due, On, The, This
related to Helium-3 spin echo · 5
Helium-3 → Cambridge, Cavendish Laboratory, Chemistry Department, Surface Physics Group, Swansea University
related to Solar nebula (primordial) abundance · 5
Helium-3 → Galileo, Jupiter, One, Terrestrial, This

Important terminology Word statistics

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

Important terminology

fusion 3he tritium helium-4 energy nuclear helium neutron per would gas neutrons superfluid protons also natural atmosphere two radioactive power

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Helium-3Half-life (t1/2)stable1.00infobox
Helium-3Isotope mass3.016029322 Da1.00infobox
Helium-3Nameshelium-3, tralphium (obsolete)1.00infobox
Helium-3Natural abundance0.000137% (atmosphere) 0.01% (Solar System)1.00infobox
Helium-3Neutrons (N)11.00infobox
Helium-3Parent isotopes3H (beta decay of tritium)1.00infobox
Helium-3Protons .mw-parser-output .nobold{font-weight:normal}(Z)21.00infobox
Helium-3Spin.mw-parser-output .sfrac{white-space:nowrap}.mw-parser-output .sfrac.tion,.mw-parser-output .sfrac .tion{display:inline-block;vertical-align:-0.5em;font-size:85%;text-align:cent…1.00infobox
Helium-3Symbol3He1.00infobox
Helium-3causesit to have a higher zero-point energy than helium-40.90text
those of the Hawaiian Islandsinstance ofSome helium-3 finds its way up through deep-sourced hotspot volcanoes0.80text
but only 300 g per year is emitted to the atmosphereinstance ofSome helium-3 finds its way up through deep-sourced hotspot volcanoes0.80text

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.