The Allasonic Effect, a.k.a. The Hot Chocolate Effect

in video •  8 years ago  (edited)

I made this little video to demonstrate a strange phenomenon!

Skip to about 50 seconds in for the good part!

[![IMAGE ALT TEXT](

"Allasonic Effect")

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8 years ago by

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      ·  8 years ago 

    Amazing to see that somebody else wondered what is causing that!
    I asked around some nerds and noone ever had a convincing explanation.
    I think its kind of a Doppler effect, but what causes It? Temperature, bubble size?

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        ·  8 years ago 

      From the wiki page:

      Upon initial stirring, entrained gas bubbles reduce the speed of sound in the liquid, lowering the frequency. As the bubbles clear, sound travels faster in the liquid and the frequency increases.

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          ·  8 years ago (edited)

        Try it at work tomorrow. You need a ceramic coffee mug and a metal spoon.

        Keep the taps at the same force/velocity and listen to the pitch rise. And rise. And rise!

        If you can't convince others that it's really happening, let them try it!

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