Inaudible Sounds

Ultrasound discovered in the early 20th century found widespread use in a wide variety of fields of science and technology.
They help detect submarines and various obstacles on the bottom of seas and rivers, are used for sounding depths, for quality control of metal structures and parts, for air purification, in medicine and the pharmaceutical industry, etc. The book by ultrasound specialist Professor Doctor of Chemical Sciences Boris Borisovich Kudryavtsev explains what ultrasound waves are, how they are produced, their properties, and their applications.