Discussion
The most widely measured smoke property is :
Answer: A
The most widely measured smoke property is the light extinction coefficient.
Smoke reduces visibility by absorbing and scattering light. Passing a light beam through the smoke and measuring how much is lost (by the Beer-Lambert relation) gives the extinction coefficient, which is used to calculate visibility through smoke and to compare how smoky different materials are in fire tests.
A Henry coefficient describes how a gas dissolves in a liquid, and 'Burgis' and 'Bonger' coefficients are not smoke properties at all.
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