Science
How does a whirlpool form?
A whirlpool works as a rotating mass of water that forms when opposing currents or a draining flow set the water spinning. As water rushes toward a low point or where currents meet, it swirls faster and faster, sometimes pulling things toward its center.
See it in motion.
Watch a 2-minute animated lesson that shows exactly how a whirlpool works.
Step by step
- 1It forms where currents collide or water drains through a narrow point.
- 2The water starts rotating and spirals inward.
- 3As it narrows toward the center, it spins faster.
- 4Strong ocean whirlpools are called maelstroms.
- 5The familiar bathtub swirl is a small everyday example.
Frequently asked questions
- What causes a whirlpool?
- Opposing currents or water draining through a narrow opening set the water rotating, and it spirals faster as it moves toward the center.
- Are ocean whirlpools dangerous?
- Most are mild, but powerful tidal whirlpools (maelstroms) can challenge small boats; the giant ship-swallowing kind is mostly myth.
- Why does water swirl down a drain?
- Water flowing toward the drain has slight rotation that gets amplified as it speeds up near the small opening, forming a vortex.