stackyFACTS
Ferrofluid contains tiny magnetic particles suspended in a liquid. A magnetic field pulls the surface into peaks, while surface tension resists and helps set their spacing. The spikes are a visible compromise between forces, not little solid needles growing out of the fluid.
Keep exploring facts in this topic.
Science →STACKY FOR IPHONEKeep discovering with Stacky. Interesting facts in an app that is always within reach.
An S wave shakes rock sideways, so it needs material that can resist being shoved out of shape. Earth’s liquid outer core can’t hold that sideways strain, and…
Discover more
The cup doesn’t know the car is braking; it simply keeps moving as before until something stops it. Friction or a bump supplies that force, and a seat belt…
Discover more
Shaking oil and water breaks the oil into tiny droplets, making the bottle look mixed for a while. But water molecules don’t interact well with oil, so the…
Discover more
Break a magnet in half and you don’t get a north piece and a south piece. Each fragment has its own north and south ends, because the magnetic poles stay…
Discover more
On a 2.25-inch billiard ball, Everest would rise only about 0.04 millimeters above sea level. Scale the planet down and its grand peaks shrink to tiny bumps,…
Discover more
A door handle gives your push more turning power when it’s farther from the hinge. The extra distance increases torque, so the same force turns the door more…
Discover more