Specific Optical Density of Smoke
Specific Optical Density of Smoke :
Optical density of smoke multiplied by a geometric factor. NOTE 1 The geometric factor is V/(AL), where V is the volume of the test chamber, A is the area of the exposed surface of the test specimen, and L is the light path length NOTE 2 The use of the term 'specific' does not denote 'per unit mass' but rather denotes a quantity associated with a particular test apparatus and exposed surface area of test specimen. NOTE 3 It is dimensionless
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