The refractive index of water at 20
°C is 1.33 nD.
Ice has a refractive index of 1.31 nD.
Adding sugar to pure water changes the refractive
index, depending on the amount added. Adding salt
changes the refractive index as well, but in relation
This means that if pure water at 20 °C does not
refractive index of 1.33, it has been “polluted”
some other material. As a rule, determining the
refractive index of a substance is a quick and reliable
check of its purity.
P3000 Series Automatic Polarimeters
40 % Brix Sugar Solution ΔnD
= 0.00015 / ºC
Paraffine Oil ΔnD = 0.00036
Main measuring display
This is where the measurement is carried out and
results as well as the important parameters are
*. Measured value: refractive index, %Brix, user-defined
*. Target and actual temperature
*. Temperature compensation
*. Status information