Acoustic emissions and rapid temperature rise have been observed along a solidification process in a supercooled water droplet. It was found that the droplet seemed to expand within a few microsecond accompanied by a production and extinction of several spherical vibrational normal modes. The temperature rise also measured with a thin thermocouple the diameter of which was 12.5μm. The observed risetime was as short as 1ms, which is the estimeted value by thermal conduction of the thermocouple. However the total solidification process is still unknown and should be eludicaed, for example, multiple AE from a single droplet.
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