A phase change.
A phase change is a physical change that occurs when an object changes from one state to another i.e. liquid to gas, gas to liquid, liquid to solid, solid to liquid. A substance need not go through the liquid phase to change from a solid to a gas, as in sublimation of dry ice (solid carbon dioxide).
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An autogenous weld is one where filler metal is not used for joining. the weld is produced by fusion of the parts by melting. It does not use force to bond the parts, only the heat produced which cause melting of the base materials.
Freezing water of is an example of physical change.
Celsius is a measure of temperature not a substance, and therefore it has no melting point. What is the melting point of what material in Celsius? [You haven't named the substance you want the melting point of/for]
low resistivity and low melting point.
A 12000btu AC is considered 1 ton of cooling. 18000btu is 1.5 tons. One ton of AC will give you the cooling you would get by melting one ton of ice. EPM