Barrer

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Barrer 

A unit of oxygen permeability of a contact lens material. Symbol: Dk. It is equal to the product of the diffusion coefficient D of oxygen through the material (i.e. the speed at which oxygen molecules pass through the material) and the solubility k of oxygen in the material (i.e. the number of oxygen molecules that can be absorbed in a given volume of material). See oxygen permeability; oxygen trans-missibility.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
He added Barra were within their rights to insist on a pitch which met the competition's rules.
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"Where we really want to make significant investments is in content, particularly in the Chinese market to start with but beyond that in other markets as well," Hugo Barra, vice-president of Xiaomi's global division, said in an interview on Friday.