Question

The process of direct change from solid to vapour is known as ?
(a) Vaporisation
(b) Sublimation
(c) Condensation
Cd None of these

Answer 1

$\mathfrak{\large{\underline{\underline{Answer :}}}}$

Option (b)

Sublimation

The process of direct change from solid to vapour is known as Sublimation.

$\mathfrak{\large{\underline{\underline{Additional\:\:Information : }}}}$

• Sublimation is the process in which the substance is directly transformed into gaseous state without going through the liquid state.

• Sublimation occurs because the object absorbs energy so quickly from the surroundings that melting never occurs.

• The word sublimation is from the Latin word sublimare, which means as “to raise a higher status.”

• If the dark coloured iodine crystals are heated in a test tube they readily convert into purple vapours. This is an example of sublimation.

• The surface layer of snow into fog or steam without melting is also an example of sublimation.

• Vaporisation is a process in which the liquid substance is converted into vapours. two types of vaporisation : Evaporation and Boiling.

• Condensation is a process of conversion of the vapours into liquid.

Answer 2

$\huge\sf{Answer:-}$

(b) Sublimation

Further Explanation

• Generally, when solid materials are heated, they first change into liquid state and then change from liquid to vapor state but when heating up heating the vertical materials, they change from solid state to vapor state .

Example:-

• Fluid states are not found in it, that is, they change state from solid to liquid, not directly into vapor.