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Rayl (cgs) (rayl) is a unit in the category of Specific acoustic impedance. It is also known as Lord Rayleigh. This unit is commonly used in the cgs unit system. Rayl (cgs) (rayl) has a dimension of ML^-2T^-1 where M is mass, L is length, and T is time. It can be converted to the corresponding standard SI unit kg/m²-s by multiplying its value by a factor of 10.

Note that the seven base dimensions are M (Mass), L (Length), T (Time), Q (Temperature), N (Aamount of Substance), I (Electric Current), and J (Luminous Intensity).

Other units in the category of Specific acoustic impedance include Kilogram Per Square Meter Second (kg/m²-s), Pascal Second Per Meter (Pa-s/m), Psi Second Per Foot (psi-s/ft), and Rayl (MKSA) (rayl).