freezing point
US /ˈfriːzɪŋ pɔɪnt/
UK /ˈfriːzɪŋ pɔɪnt/
1.
the temperature at which a liquid turns into a solid when cooled
:
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The freezing point of water is 0 degrees Celsius.
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Salt lowers the freezing point of water, which is why it's used on icy roads.