Brewster
Encyclopedia : B : BR : BRE : Brewster
For other uses, see Brewster (disambiguation)}}}.
The
Brewster (
B) is a unit used to measure the susceptibility of a material to
photoelasticity, or the value of the Stress Optic Coefficient of the material. The unit has dimensions reciprocal to those of stress. One
Brewster is defined to be equal to [10^]
square metres per
newton (m²/N or 1/Pa) or [10^] square centimetres per
dyne (cm2/dyn). The unit is named after
David Brewster, who discovered stress-induced
birefringence in
1816.
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