the scientific method of measuring the freezing point of liquids to determine the presence and concentration of dissolved substances.
From Greek 'kryos' (cold) + 'skopein' (to observe), coined as a chemistry technique where the freezing point depression reveals information about solution composition.
Cryoscopy is one of four 'colligative properties' that chemists use as analytical tools—the others involve boiling point, vapor pressure, and osmotic pressure, and they all depend on the number of particles dissolved, not what they are.
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