Physicists have seen a region of plasma in a single-bubble sonoluminescence experiment for the first time. They have also found that the temperature inside the bubble can reach up to 20,000 K (D Flannigan and K Suslick 2005 Nature434 52).
Collapsing bubbles
In sonoluminescence, the bubbles in a liquid emit light when they are forced to expand and collapse
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Isabelle Dumé
is a contributing editor to Physics World