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Bubbles feel the heat 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 Nature 434 52).
In sonoluminescence, the bubbles in a liquid emit light when they are forced to expand and collapse by sound waves. Some physicists believe that the pressures and temperatures inside the collapsing bubbles could be high enough to initiate nuclear reactions.
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