Why don't bath systems just inject pure H₂?

Without small-bubble engineering, most of the gas escapes the water surface before dissolving.

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Level 3 · Advanced· 6 min read·Updated 2026-06-27

Hydrogen dissolution

Generating H₂ is only half the job for bath and water systems. Dissolving it into water at meaningful concentration requires bubble engineering.

Key takeaways

Smaller bubbles dissolve faster and stay suspended longer.
Nanobubbles (<200 nm) can persist in water for hours.
Saturation at 25°C and 1 atm is ~1.6 ppm.

Bubble size and residence time

Surface area scales as 1/r. A nanobubble has thousands of times more surface area per unit volume than a millimetre bubble, so dissolution into the surrounding water is far faster.

Persistence matters for bath systems: a microbubble rises and pops; a nanobubble stays suspended and continues to off-gas H₂ into the water.

Frequently asked questions

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Source content adapted from guides/nanobubble-vs-microbubble-hydrogen.