Normally, water freezes to become ice at 0° Celcius, 32° Fahrenheit and 273.15 Kelvin.
If there is a foreign substance in the water, the freezing point is lowered.
For every mole of a substance, such as salt, added to the water, the freezing point is reduced by approximately 1.8°C.
Basically the more stuff added to the water, the colder it needs to be to freeze.
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