A Rayl (symbol: Ray) is a unit of acoustic impedance in the field of acoustics. It is used to measure the resistance of a medium to the propagation of sound waves. Acoustic impedance is defined as the ratio of the acoustic pressure to the particle velocity in a sound wave. In more technical terms, the Rayl is defined as: 1 Rayl = 1 kg/(m²·s) (which is equivalent to the units of pressure per particle velocity).
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