Key takeaways
- Inhalers: purity is reported as a percentage (typically ≥99.991%).
- Bath and water: dissolved H₂ is reported in ppb or ppm.
- 1 ppm = 1,000 ppb = 1 mg/L.
Units in context
Inhaler purity is a fraction of the gas stream. Bath system output is a concentration in liquid. These are not interchangeable numbers.
Frequently asked questions
At standard pressure and 25°C, water saturates at approximately 1.6 ppm of H₂. Higher figures require elevated pressure during dissolution.
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Home vs professional systems
Continue →Purity, tablets & bathing
- Hydrogen Bathing vs Hydrogen Tablets — Saturation versus dilution, compared in full.
- Hydrogen Water Purity — 99.991% certified purity from SPE/PEM electrolysis.
- Hydrogen Tablets: What You Should Know — What dissolving reactive material can leave behind.
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