Rice KrispiesTM Crackle!
If you have some Rice KrispiesTM or other
crisped rice cereal at home, you can listen to what we're calling
crackling noise. Get a bowl, fill it with the cereal, and pour on
LISTEN CAREFULLY to the crackling noise. It's quiet, but if you put your ear
right up next to the cereal (don't get your hair into the milk!) you'll hear
lots of tiny sounds.
Just like popcorn popping, the sounds come at random times. Sometimes
a lot will happen at once, and sometimes there will be quiet periods.
You'll notice that some of the sounds are louder, and some are really, really
quiet. The sounds come with random sizes. Crackling noise happens
when lots of short sounds come at random times, with some sounds much louder
than other sounds.