Oxygen O2 Bubbles black filled icon
Outline O2 symbol made of a large circle, a subscript 2 and two small bubbles
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About the Oxygen O2 Bubbles black filled icon
A large open circle stands in for the letter O, followed by a numeral 2 at subscript height, while two smaller rings float above like rising bubbles. Together they read as the oxygen molecule and suggest breathing, fresh air and life support. Useful in medical and respiratory app interfaces, hospital wayfinding, diving and aquarium products, air purifier packaging, and chemistry or science teaching material.
Composition is deliberately unbalanced: the main ring anchors the lower left, the two bubbles step diagonally upward, and the thin numeral keeps the formula legible. Stroke weight stays even across every circle. It pairs with oxygen tank, lungs, molecule and air quality icons. Use at 32 px or above so the small 2 does not blur.
This is the solid black filled version of the oxygen o2 bubbles icon: a bold silhouette that reads clearly at 16-24 px and on dark or busy backgrounds, and prints well in one colour.
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.
