Freezing is the change in state from liquid to solid by reducing its temperature. The Freezing point or Melting point of a substance is the temperature at which a material changes from a solid to a liquid (or vice versa). The temperature remains constant until all of the substance has changed its state.
The Freezing point of nearly all liquids is lowered by adding another substance.
For example if you add an equal amount of antifreeze containing ethanediol (ethylene glycol) to an equal amount of water, the water which normally freezes at 0°C will now freeze at -37°C (the ethandiol freezes at -13°C).
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