Key takeaways
- H₂ is diatomic hydrogen — two atoms, one bond, no charge.
- It is colourless, odourless and lighter than air.
- Machine-grade H₂ is produced on demand via electrolysis of pure water.
- Output is measured in millilitres per minute (ml/min) at a specific purity.
The smallest molecule
Hydrogen is element number one. A single H atom is just a proton and an electron. In nature it almost always pairs up with another H atom to form H₂ — a diatomic molecule held together by a single covalent bond.
Because H₂ is so small, it diffuses through air and across many materials faster than any other gas. Engineering hydrogen equipment therefore has to control where the gas goes and what it touches.
Where machine-grade H₂ comes from
Industrial hydrogen is usually made from natural gas (steam-methane reforming). That route carries impurities and is unsuitable for inhalation or bathing.
Consumer and professional hydrogen machines use water electrolysis through a Proton Exchange Membrane (PEM). Pure water is split into H₂ and O₂; only the H₂ stream is delivered to the user. Purity is typically see model documentation.
How H₂ is measured
Two numbers matter on a machine spec sheet: flow rate (ml/min) and purity (%). Flow rate tells you how much gas reaches the cannula, mask or bath; purity tells you what fraction of that flow is actually H₂.
For dissolved H₂ in water, the unit is parts per billion (ppb) or milligrams per litre (mg/L). 1.6 ppm = 1.6 mg/L = a saturated solution at standard pressure and temperature.
Engineering notes
- · H₂ is generated on demand because storing pressurised H₂ at home is impractical and regulated.
- · Higher flow rates require larger PEM stack area, more power and active cooling — directly affecting machine size and price.
Frequently asked questions
Related products
Related learning
Purity, tablets & bathing
- Hydrogen Bathing vs Hydrogen Tablets — Saturation versus dilution, compared in full.
- Hydrogen Water Purity — model-specific gas composition from SPE/PEM electrolysis.
- Hydrogen Tablets: What You Should Know — What dissolving reactive material can leave behind.
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Source content adapted from guides/molecular-hydrogen-and-exercise.
