A sample of substances like camphor, naphthalene or dry ice disappears after some time when exposed to air. This phenomenon is called

उत्तर दाखवा आणि स्पष्टीकरण

उत्तर: (A) Sublimation

स्पष्टीकरण

Sublimation is the direct change from solid to vapour without melting, as seen in camphor, naphthalene and dry ice (solid CO2).