Sound Increases the Efficiency of Boiling

In those units, the ultrasound is used to vibrate the dirt and shake it loose. The ones I know of (used in cleaning medical instruments) operate nowhere near the boiling point of the liquid.

Actually, you're correct as far as the units you mean, and I was wrong to include the home ultrasonic jewelry cleaners.

The factory units I referred to, however, used boiling solvents. Of course, many solvents boil at lower temperatures than water. Some common solvents I saw used, like trichlorotriflouroethane, boil at quite low temperatures (118F, 47.7C for "Trich").

The effect of the ultrasound on the boiling liquid was startling. With the ultrasound transducer(s) switched off, the solvent boiled in the nor

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