Facts about Sound

• Sound is a continuous longitudinal wave that travels throgh the air.
• The wave is made up of pressure differences.
• Example of generating waves:

• Sound waves have usual wave properties (reflection, refraction, diffraction, etc.)
• Sound is detected by measuring the pressure level at a point:

• The amplitude of a sound is the measure of displacement of the air pressure wave from its mean:

-- Brian Smith notes, 1996.