Going to reinterpret your question as being just ‘very hot’. In order to melt something you need for it to transfer heat to said other things. If, for instance, you have a thin wire inside a glass bulb that is near vacuum or filled with a very low pressure inert gas, and you run an electrical current through that wire, it will get hot enough to glow, such that the electrical energy input is the same as the heat and light output. https://en.wikipedia.org/wiki/Incandescent_light_bulb
You an also have very things very hot that have very small mass, like a plasma encased in magnetic fields. https://en.wikipedia.org/wiki/Inductively_coupled_plasma
Other possibilities are that it’s only that hot for a very short time, like a bolt of lightning or a spark from a spark plug. So we’re not talking about taking, for instance, a huge chunk of magma and getting it even hotter.
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