# Bubble Blowing (DD-479)

> A bubble ring is a vortex ring of rotating water with air trapped in its core. When two collide, their vortices interact: head-on rings may briefly merge before breaking into smaller bubbles, while angled collisions can twist, reconnect or pass through each other, the Reel says. Outcomes depend on speed, rotation and angle. The footage, credited to astronomy.views, shows divers' bubble rings meeting underwater.

- Department: Science
- First published: 2025-02-05
- Last updated: 2025-02-05
- Permalink: https://detailenjoyer.com/case/bubble-blowing/
- Author: Marcus Easterling (DetailEnjoyer), The Detail Department

## Quick facts

- **DD-479-F01**: Vortex ring. _(Write-up · Exhibit A (Structure))_
- **DD-479-F02**: Trapped air. _(Write-up · Exhibit B (Core))_

## Write-up

Underwater bubble rings can merge, bounce or break apart. It depends on speed, spin and angle.

1. **Structure**: Vortex ring.
2. **Core**: Trapped air.
3. **Head-on**: Merge, then break.
4. **Angled**: Twist or pass through.
5. **Factors**: Speed, spin, angle.

## Related case files

- [Preserve Your Bubbles (DD-326)](https://detailenjoyer.com/case/preserve-your-bubbles/): I linked more bubbles

## Reel vs. record

- **Note**: None needed.

## Video: Bubble Blowing: Underwater Bubble Rings Can Merge, Bounce or Break Apart

- Duration: 23.6 s · Published: 2025-02-05
- File: https://detailenjoyer.com/assets/videos/DFsa2_7pC-F.mp4

### Transcript

Did you know, when bubble rings collide underwater, their vortex structures interact in complex ways, leading to merging, bouncing, or breaking apart. These rings are rotating loops of water with trapped air, and their behavior upon collision depends on factors like speed, rotation, and angle. If two rings meet head-on, they may temporarily merge before destabilizing into smaller bubbles. When they collide at an angle, they can twist and pass through each other due to the conservation of momentum. NOW YOU KNOW!

## Questions & answers

**Q: What is a bubble ring?**  
A: Rotation. _(Source: Write-up · Exhibit A (Structure) · Wikipedia: Bubble ring)_

**Q: Core contains?**  
A: Trapped. _(Source: Write-up · Exhibit B (Core) · Wikipedia: Bubble ring)_

**Q: Head-on result?**  
A: Unstable. _(Source: Write-up · Exhibit C (Head-on) · Wikipedia: Bubble ring)_

**Q: Factor?**  
A: Spin. _(Source: Write-up · Exhibit D (Angled) · Wikipedia: Bubble ring)_

**Q: Angled rings may?**  
A: Reconnection. _(Source: Write-up · Exhibit E (Factors) · Wikipedia: Bubble ring)_

## Sources

- [Wikipedia: Bubble ring](https://en.wikipedia.org/wiki/Bubble_ring)

## Cite this case file

Easterling, Marcus. "Bubble Blowing." The Detail Department (DetailEnjoyer), case file DD-479, last updated Feb 5, 2025. https://detailenjoyer.com/case/bubble-blowing/