Marshmallow madness

With help from a marshmallow and syringe (without the needle!), you can create pressure that's stronger than the atmosphere, right in the palm of your hand. The experiement comes from pages of the Nat Geo Kids book Try This! Extreme.

This experiment teaches principles of pressure, properties of foam, and ocean science. Uh, what do marshmallows have to do with the ocean? With this demonstration, you'll be able to basically see the effect of deep-sea pressure on just one marshmallow!

WHAT'S GOING ON

The marshmallow may look solid, but it’s actually full of air pockets—a foam. When you pump air in, you increase the pressure on the marshmallows and the air inside them is compressed. When air rushes back in, the marshmallows may get larger—and if you suck it out they may get smaller.

TRY THIS! EXTREME TEXT COPYRIGHT © 2017 KAREN ROMANO YOUNG