Principles and instruments for measuring crystallization points

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Principle of determining material concentration by measuring the crystallization point: There is a direct proportionality between the crystallization point of a substance and its concentration; by measuring the crystallization point, its concentration can be determined accordingly； The liquid material is cooled; when crystallization occurs in the liquid, a mixture of solid and liquid exists within the system, at which point the two phases are in equilibrium and the temperature remains constant. By observing the temperature changes during the crystallization process, it is possible to determine the crystallization point. Our factory has a device for measuring the crystallization point, but I’m not very familiar with the specific principle behind the instrument. I’m posting this to invite everyone to discuss: what are the methods used in industry to determine the crystallization point of substances? The more detailed, the better.