hydrogen
Let an agent explain hydrogen and its properties, relay isotopes, production routes, uses and safety from reference sources, present energy transition debates with attribution, and distinguish hydrogen the element from hydrogen energy policy.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain hydrogen and its properties, relay isotopes, production routes, uses and safety from reference sources, present energy transition debates with attribution, and distinguish hydrogen the element from hydrogen energy policy.
The chemical element with symbol H and atomic number 1, the lightest and most abundant element in the universe, a colourless diatomic gas at standard conditions with isotopes protium, deuterium and tritium and the unstable hydrogen-4, forming water and most organic compounds; hydrogen is produced mainly from natural gas as grey hydrogen, with carbon capture as blue hydrogen and by electrolysis with renewable power as green hydrogen, and is used in ammonia, refining, fuel cells and as a proposed energy carrier, while deuterium ratios serve as tracers in science.
What it is for: Chemical feedstock, fuel and energy carrier.
It can be relay properties and isotopes; explain production routes and colours; describe uses and safety; present energy debates neutrally.
Distinguishing features
Lightest element
Most abundant in the universe
Three main isotopes
Energy carrier debates
What it looks like
A colourless, odourless gas; liquid at very low temperature.
Physical character
atomic number: 1 Z
standard atomic weight: 1.008 u
boiling point: -252.9 degrees C
flammability range in air: about 4-75 percent
How it is recognised
Element 1, symbol H
Protium, deuterium, tritium; grey, blue, green hydrogen
Helium is the next element; hydrocarbons contain hydrogen but are compounds
Related models
is a kind of - in registry terms
is a kind of - element in registry terms
is a kind of - in registry terms
is produced by - and electrolysis
In practice
Families and kinds
protium, deuterium and tritium and short-lived isotopes such as hydrogen-4
molecular hydrogen and atomic hydrogen
grey, blue, green, pink and turquoise hydrogen by production route
hydrogen compounds such as water, ammonia and hydrides
deuterium ratio as an isotopic tracer
Identifiers
symbol H
CAS 1333-74-0 molecular hydrogen
Standards and regulation
Hydrogen safety codes and standards such as ISO 19880
Pressure vessel and transport regulations
Low-carbon hydrogen certification schemes
Tritium handling and radiation rules
Failure modes and hazards
Flammability and explosion
Embrittlement of metals
Overstated or partisan energy claims
Tritium radiation
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.hydrogen
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Identify What hydrogen is.
Identity.
Properties
Properties.
Properties
Properties.
- What are the physical and chemical properties of hydrogen? definition
- Is the question about the element, its isotopes or hydrogen energy? boundary
Isotopes
Isotopes.
Isotopes
Isotopes.
- What are protium, deuterium and tritium, and how is the deuterium ratio used in science? definition
- Which entry fits the specific isotope? action
Produce Production.
Industry.
Routes
Production routes.
Routes
Routes.
- How is hydrogen produced by reforming, electrolysis and other routes, and what do the colour labels mean? provenance
- Which entry fits the specific route? action
Supply
Supply and cost.
Supply
Supply.
- How much hydrogen is produced, and what do reports say about costs and emissions, with sources? measurement
- Which sources are cited? provenance
Use Uses and safety.
Application.
Uses
Uses.
Uses
Uses.
- How is hydrogen used in ammonia, refining, fuel cells, steelmaking and transport? provenance
- Which references are standard? provenance
Safety
Safety.
Safety
Safety.
- What safety rules govern hydrogen storage, transport and use? provenance
- Which entry fits hydrogen safety? action
Context Energy debate and history.
Attribution.
Debate
Energy transition.
Debate
Debate.
- What do analysts say about the role of hydrogen in decarbonisation, with positions attributed? provenance
- Is the presentation neutral? boundary
History
History.
History
History.
- How was hydrogen discovered by Cavendish and named by Lavoisier, and how did its uses develop? provenance
- Which entry fits the history of chemistry? action
What the second pass must settle
- Should hydrogen economy and deuterium be separate primary entries?
- How should reference and policy sources be linked?
- The registry entry has merged aliases naming isotopes, colours and a ratio; should they be split off?