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Level 2 · Buyer· 4 min read·Updated 2026-06-27

Hydrogen concentration explained

Hydrogen concentration is reported in different units depending on whether you're measuring gas at an outlet or dissolved H₂ in water.

Key takeaways

  • Inhalers: purity is reported as a percentage (typically ≥99.99%).
  • 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

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