Why naphthalene sublimes at room temperature if its melting point is 80 degree?

Answer 1

The definition of sublimation is when a material goes directly from solid to gas phase, without melting first. If the material is liquid and it transforms to gas, that's called evaporation (when it's gradual at any temperature) or boiling (when it all starts to change state at the boiling point). Whenever a solid vaporizes into gas phase, that's called sublimation.

Naphthalene appears to sublime below its melting point because molecules are constantly leaving the surface (it has a high vapour pressure) and these molecules disperse into the air.

Answer 2

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