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Sonoluminescenece
This is an interesting piece of science. It is a good field of study as current physics can not explain how this occurs. The chaotic form of this, multiple bubble sonoluminescenece has been around since the thirties when it was discovered as a byproduct of sonar research using ultrasonic sound. It was disocvered that by applying ultrasonic waves to very pure water, one could generate glowing bubbles. This conversion of sound to light makes for a very interesting topic. The bubbles' flash lasts for a very brief amount of time, in ther order of tens of pico seconds. It is also very hot and suspected to be of very high pressure. It is widely believed that the temperature is at least ten thousand degrees Centigrade, but some believe it is much higher, say ten million at the most. These conditions have made it a suitible theorectical vessel for a fusion reactor. See the bubble fusion for more.
I have some ultrasonic transducers, an oscillioscope, a microphone, and a function generator so I'm well under way. I hear it is very important that you use a very high quality function generator, but mine is at least a solid state one that uses an integrated circuit, so yay. I don't know if it will be able to get to high enough frequencies though. It does look decent on the oscillioscope though, so it might work. The thing that I'm really missing is a boiling/distilling flask. You need a 100mL round boiling flask, and the only rounded boiling flask I have has a flat bottom and is 1000mL AND has some chips in the rim in addition to not being thick walled. So its out of the question. After that I don't have anything close.