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The results of the numerical simulations as a function of acoustic amplitude for various ultrasonic frequencies for the first collapse of an isolated air bubble [41]. The ambient bubble radii are 5 μm for 20 kHz, 3.5 μm for 100 and 300 kHz, and 1 μm for 1 MHz. (a) The temperature inside a bubble at the violent collapse. (b) The molar fraction of water vapor inside a bubble at the end of the violent collapse. Copyright 2007, with permission of AIP Publishing.
