Boiling is a phase transition from the liquid phase to gas phase that occurs at or above the boiling temperature. Boiling, as opposed to evaporation, occurs below the surface.
Sublimation is a direct phase transition from the solid phase to the gas phase, skipping the intermediate liquid phase.
The term vaporization has also been used to refer to the physical destruction of an object that is exposed to intense heat. As noted in discussions of the effects of nuclear weapons, this includes the vaporization of human bodies by the 1945 atomic bombings of Hiroshima and Nagasaki and the vaporization of the uninhabited Marshall Island of Elugelab in the 1952 Ivy Mike thermonuclear test.
A flux of so many gamma ray, x-ray, ultraviolet and heat photons strikes matter in a such brief amount of time (a great number of high-energy photons, some overlapping in the same physical space) that all molecules lose their atomic bonds and "fly apart". All nuclei lose their electron shells and become positively-charged ions, in turn emitting photons of a slightly lower energy than they had absorbed. All such matter becomes a gas of nuclei and electrons which rise into the air due to their high temperature or bond to each other as they cool.
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