Sonoluminescence is typically regarded as a special case of homogeneous sonochemistry.

Sonochemistry - is the study of effect of sonic waves and wave properties on chemical systems.

Studies have shown that no direct coupling of the acoustic field with chemical species on a molecular level can account for sonochemistry or sonoluminescence.

Ultrasonic extraction, a branch of sonochemistry, can greatly accelerate extraction processes.

Instead, sonochemistry arises from acoustic cavitation: the formation, growth, and implosive collapse of bubbles in a liquid.

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For many processes, this sonochemical (see sonochemistry) effect leads to a substantial reduction the reaction time, like in the transesterification of oil into biodiesel.

Sonochemistry can be performed by using a bath (usually used for ultrasonic cleaning) or with a high power probe, called an ultrasonic horn.

Sonochemistry: the uses of ultrasound in chemistry T. J. Mason (ed)

Cavitation - the formation, growth, and implosive collapse of bubbles irradiated with sound - is the impetus for sonochemistry and sonoluminescence.

Specialisms include medical ultrasonics (including medical ultrasonography), sonochemistry, material characterisation and underwater acoustics (Sonar).

He is the world's leading expert on the chemical and physical effects of ultrasound and has received numerous awards for his work on sonochemistry and sonoluminescence.

He has extensively contributed to the development of organocatalysed synthesis, biomimetic synthesis, multicomponent reaction, sonochemistry, enzymatic synthesis, high-throughput synthesis and diversity oriented synthesis.

More recent work, such as Eon, develops novel high-energy ultrasound, sonochemistry and plasma physics to explore the creation of "material poetry," art formed from the discrete interactions of matter and energy.

Three classes of sonochemical reactions exist: homogeneous sonochemistry of liquids, heterogeneous sonochemistry of liquid-liquid or solid-liquid systems, and, overlapping with the aforementioned, sonocatalysis.

He also has considerable contributions in the area of organic chemistry particularly in the development of organocatalysed synthesis, Biomimetic synthesis, multicomponent reaction, Green chemistry, sonochemistry, enzymatic synthesis, and diversity oriented synthesis, Functional Ionic Liquid Mediated Synthesis (FILMS).

Another function of the ultrasonic horn is to efficiently transfer the acoustic energy from the ultrasonic transducer into the treated media, which may be solid (for example, in ultrasonic welding, cutting or soldering) or liquid (for example, in ultrasonic homogenization, sonochemistry, milling, emulsification, spraying or cell disruption).