| − | The [[melting point]] of any [[pure substance]] is the temperature, under a standard atmosphere of pressure, at which that substance melts (if this point is warmer than about 298 [[kelvin]]s) or freezes (if that point is cooler). Some pure substances do not melt, however; they decompose. | + | The [[melting point]] of any [[pure substance]] is the temperature, under a standard atmosphere of pressure, at which that substance changes status from a liquid into a gas, or vice versa. |