These tricks will make your children think they have superpowers—but it’s really all about the science
Have kids stand over the sink and pierce the can’s top half with the needle. Drain about half the soda into a glass. Crush the sides of the can until it looks empty.
Tell kids to hold the can with one finger over the hole—then shake. The can will look like it’s “magically” refilling! If they’re performing this for an audience, have them pop the top and take a sip.Of course, the can isn’t refilling with soda—but thanks to carbonation, it’s refilling with gas.is the process of dissolving carbon dioxide into a liquid. To do this in things like soda, scientists useto dissolve the carbon dioxide and seal the can to keep the pressure in.
Because there’s no place for the gas to go in a sealed can, the carbon dioxide builds up. That’s why soda will explode in your face if it’s shaken before opening. It’s also why—if half the liquid has been drained and a finger is over the hole when the crushed can is shaken—the gas pushes outward on the crumpled sides of the can so it appears to be filling up.Please be respectful of copyright. Unauthorized use is prohibited.
When you light the paper, the air molecules inside the bottle warm up and move around, which expands the air and decreases the air’s density. But when the fire goes out, the air suddenly cools—the molecules slow down and move closer together, increasing the density so the air takes up less space. Usually the air outside the bottle would rush in to fill this space—but now the egg is in the way! Instead, the air pressure outside of the bottle pushes the egg into the bottle.
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