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Audible Range
The range of frequencies that a typical human can hear, about 20 Hz to 20 kHz.
Compression
A compression is a region in a longitudinal wave where the particles of the medium are close together, resulting in a high-pressure area.
Diaphragm
A thin, flexible surface that vibrates to create or detect sound waves.
Longitudinal wave
A wave in which the oscillations of the medium are parallel to the direction the wave travels.
Rarefaction
A rarefaction is a region in a longitudinal wave where the medium's particles are spread apart, creating a low-pressure region.
Sound
Sound is a type of wave, a traveling disturbance that transfers energy from one place to another.
Ultrasound
Sound with frequency above the upper limit of human hearing (about $20\ \text{kHz}$).