Oxygen O2 Bubbles black outline icon
Outline icon of three circles of different sizes with a subscript numeral 2 for oxygen
About the Oxygen O2 Bubbles black outline icon
Three ring-like circles of different sizes float across the frame, with a numeral 2 set low at the right so the group reads as the chemical formula O2 and as rising bubbles at the same time. It communicates breathable air, oxygenation and gas concentration. Use it in air purifier and HVAC interfaces, chemistry lesson slides, hospital oxygen therapy screens, diving apps and environmental dashboards.
Varying the circle diameters and scattering them diagonally creates the drift of bubbles, while the subscript numeral pins the meaning to the formula. It pairs with CO2, nitrogen and water-drop icons in the same science set. Keep clear space at the lower right so the 2 is not cropped.
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.
