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1. In 1873 Dr. Reynolds O. UK Investigated theoretically and discovery Cavitation as physical phenomenon.
2. In 1893 Cavitation phenomenon was discovered on torpedo board "Daring", UK.            The UK Admiralty charges Lord Raleigh to investigate Cavitation phenomenon.
3. In 1917 Lord Raleigh published "On the pressure developed in liquid during the collapse of a spherical cavity" and shown that with decrease radius of bubble the   velocity and acceleration of bubble's wall increase at no allowance.
4. However, only In early 1980th the Cavitation phenomenon began to use as technological process in the United States, Russia, Ukraine, UK and European countries.
5. Cavitation in a liquid occurs due to the stresses induced in the  liquid  by  the     passing of a sound wave through the liquid. A sound wave consists of compression    and decompression cycles. If the pressure during the decompression cycle is low enough, the liquid can be torn apart to leave small bubbles.
6. These cavitation bubbles are at the heart of Sonochemistry processing systems. These bubbles are now subjected to the stresses induced by the sound waves. This causes the bubbles to grow during a decompression phase, and contract or even implode during a compression phase. These bubbles are filled with vapor and gas,           and can produce radicals during implosion.
7. It is these implosions, which are the spectacular part of Sonochemistry science.        Each one of these imploding bubbles can therefore be seen as a micro-reactor, with temperatures reaching an estimated 5000°C, and pressures of several hundreds of atmospheres. The high temperatures and pressures created during bubble implosion can even  cause the bubbles to produce a flash of light named Sonoluminescence.