Cool Science - 2/17/14: Sound Needs Medium

By Emma Koch - 21Alive

February 24, 2014 Updated Feb 24, 2014 at 11:11 AM EST

FORT WAYNE, Ind. (21Alive) -- In this week's episode of Cool Science Monday, Martin Fisher from Science Central will talk about how sound needs a medium.

The medium can be a solid, liquid or gas. Martin showed a long cardboard tube with a metal spring in it. When he shook the tube, the vibration passed through two solids (the metal spring and the cardboard tube) and then a gas (the air in the room) for us to hear it.

Next, he showed a home activity, where sound will only pass through solids. Take a metal coat hanger, tie a string on each corner, wrap the strings around your fingers and stick your fingers in your ears. Tapping the coat hanger with a pencil produces a vibration, which passes from hanger>string>finger>ear.

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