Cloud point measurement
What is a cloud point of a liquid?
The cloud point of a sample is the temperature above which it presents solid particles which give it a cloudy appearance. This formation may be due to a solubility limit reached at the temperature in question, or else to a solidification temperature.
How to measure the cloud point?
Most often, the cloud point of a sample is determined visually, by placing the sample in a closed transparent container and subjecting it to a controlled temperature ramp.
However, there are devices specifically dedicated to this measurement, used in particular in the oil field.