| 单词 | depression of freezing point |
| 释义 | depression of freezing point The reduction in the freezing point of a pure liquid when another substance is dissolved in it. It is a colligative property - i.e. the lowering of the freezing point is proportional to the number of dissolved particles (molecules or ions), and does not depend on their nature. It is given by δt = KfCm , where Cm is the molar concentration of dissolved solute and Kf is a constant (the cryoscopic constant ) for the solvent used. Measurements of freezing-point depression (using a Beckmann thermometer) can be used for finding relative molecular masses of unknown substances |
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