Melting (fusion) |
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Salt is scattered on roads in the winter in cold countries to melt ice, when the temperature is still below zero degrees Celsius.  The temperature reached by a mixture of equal parts of ice, water and salt was used by Fahrenheit to set the zero of his temperature scale. |
| Note: many melting points can be lowered by adding a flux (cryolite to alumina, borax to clay). |