Relation between refractive index and density of material

1. Jan 24, 2015

sjumesh

Hello all,
I had clarified that refractive index of material such as(aluminium, copper, lead, teflon)changes with the temperature.
the refractive index change even for this temperature range: -196 to 25°C ?
I need to know like any law which gives a direct relationship between
1)the density and refractive index of material.
2) relation between temperature and refractive index.
eg.) in field of polymer lorentz lorentz law gives the direct relationship between refractive index and density.