Hot Chocolate Effect

As defined by Wikipedia:

The hot chocolate effect, also known as the allassonic effect, is a phenomenon of wave mechanics first documented in 1980 by Frank Crawford, where the pitch heard from tapping a cup of hot liquid rises after the addition of a soluble powder. It was first observed in the making of hot chocolate or instant coffee, but also occurs in other situations such as adding salt to supersaturated hot water or cold beer.

     Posted By: Alex - Thu Nov 12, 2020
     Category: Noises and Other Public Disturbances of the Peace | Science

Mr. Wizard knows about this, rest assured.
Posted by Virtual in Carnate on 11/12/20 at 11:37 AM
I've noticed the phenomenon, but had no idea that it actually had a name. In my experience, it helps that one has a glass container to be noticeable.
Posted by KDP on 11/13/20 at 08:30 AM
Interesting. I thought Sixty Symbols had done a video about it as well, but I can't find it.
Posted by Richard Bos on 11/14/20 at 07:56 AM
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