EVERYDAY SCIENCE

SCIENCE

PHYSICS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Some solids do not melt when heated under normal conditions,instead they change directly from the solid to the gaseous state. This phenomenon is called.
A
External pressure
B
Atmospheric pressure
C
Oxidation
D
Sublimation
Explanation: 

Detailed explanation-1: -Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state.

Detailed explanation-2: -Hence, the process through which a solid directly changes to a gaseous state without passing through a liquid state is called sublimation.

Detailed explanation-3: -When a substance converts directly from its gaseous state to solid state, it is said to be deposited. and the process is known as deposition.

Detailed explanation-4: -However there are some substances which on heating directly turn into gases from solids. camphor iodine crystals and solid carbon dioxide are such substances. Such substances are called sublimatory substances and this process of conversion is known as sublimation.

Detailed explanation-5: -desublimation (countable and uncountable, plural desublimations) (physics) deposition (transformation of gas into solid without an intermediate liquid phase)

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