Oxygen O2 Bubbles black outline icon
Outline large circle with a subscript 2 forming O2, with three small bubbles above
About the Oxygen O2 Bubbles black outline icon
One large circle carries a subscript 2 to spell the O2 formula, with three smaller bubbles rising above it. The mark communicates oxygen, breathable air and gas supply without showing a tank or mask. Use it on medical and respiratory device pages, air purifier product sheets, chemistry teaching slides, diving and fitness apps, and air quality dashboards.
The big circle anchors the composition while the three loose bubbles vary in size to suggest upward motion. Stroke weight matches the numeral, so neither element dominates. It pairs with lung, air filter and molecule icons. Keep it at 32 px or larger so the subscript stays legible.
This is the black outline version of the oxygen o2 bubbles icon: even, monoline strokes that stay crisp at small sizes and suit clean, minimal interfaces, wireframes and light backgrounds.
It downloads free as an SVG vector or transparent PNG in seven sizes, and the free online editor lets you recolor it, apply gold, silver, neon and gradient styles, add animation, or convert it to EPS, PDF and DXF.
Free for personal and commercial use with attribution.
