Elastic means such as air and more solid means are subject to continuous transition when the wave is transmitted. In non-elastic means such as water or more liquid means, continuous transition occurs while the range of the “noise” of the sound is relatively low. When the range increases, the amount of negative pressure in the rarefaction areas becomes sufficient to make the liquid break up due to the negative pressure, causing a phenomenon known as cavitation. The cavitation bubbles are created in the rarefaction sites when the liquid breaks up or splits due to the negative pressure of the sound wave in the liquid. When the fronts of the wave pass, the cavitation bubbles oscillate under the influence of the positive pressure, growing until they reach an unstable size. Finally, the violent collapse of the cavitation bubbles results in implosion, which causes shock waves that must be radiated from the collapse sites. The collapse and implosion of myriads of cavitation bubbles in activated liquid result in the effect commonly associated with ultrasound. It has been calculated that temperatures in excess of 10,000°F and pressures in excess of 10,000 PSI are generated by the implosion of cavitation bubbles.