Sabin (unit)

The Sabin , named after the American physicist Wallace Clement Sabine is the unit of measurement for sound - absorption capacity of a surface in the room acoustics : ${\ displaystyle A}$ ${\ displaystyle S}$

{\ displaystyle {\ begin {alignedat} {3} A & = A_ {1} && + A_ {2} &&& + \, ... + \, A_ {n} \\ & = \ alpha _ {1} S_ { 1} && + \ alpha _ {2} S_ {2} &&& + \, ... + \, \ alpha _ {n} S_ {n} \\ & = \ sum _ {i} \ alpha _ {i} S_ {i} \ end {alignedat}}}

With

the dimensionless sound absorption coefficient of the material ${\ displaystyle \ alpha _ {i}}$
the geometric surface of the material in . ${\ displaystyle S_ {i}}$ ${\ displaystyle \ mathrm {m ^ {2}}}$

It follows:

one square meter of material with a sound absorption coefficient of 100% has a value of 1 sabin or 1 m² sabin ${\ displaystyle \ alpha}$
one square meter of material with a sound absorption coefficient of 50% has a value of 0.5 m² sabin
a half square meters of material whose sound absorption coefficient is 100%, also has a value of 0.5 m² Sabin.

In the USA, the sabin is not referred to square meters but to square feet , which is why the words "m² Sabin" or "ft² Sabin" are often used:

1 ft² Sabin = 0.09290304 m² Sabin

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