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).

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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).
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