refractive index increment

in polymer chemistry
The change of the solution @[email protected], \(n\), with solute concentration, \(C\), i.e. \(\frac{\partial n}{\partial C}\).
  1. The solute concentration is most frequently expressed in terms of mass concentration, molality or @[email protected] If expressed in terms of mass concentration or molality, the corresponding @[email protected] increments are referred to as specific or @[email protected] @[email protected] increments, respectively.
  2. Following use of the full name, the abbreviated name refractive increment may be used.
Purple Book, 1st ed., p. 65 [Terms] [Book]