Question

Define these terms:

1. Boiling
2.Freezing
3.Melting
4.Condesation
5.Sublimation

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Answer 1

Answer:

(a) Melting - The conversion of a solid to its liquid state is melting.

(b) Vaporisation - The conversion of a liquid to its gaseous state i.e. vapours by heating is vaporisation.

(c) Condensation - The conversion of vapor in gaseous state to its liquid state by cooling is condensation.

(d) Freezing - The conversion of a liquid to its solid state is freezing.

(e) Melting point - The temperature at which solid melts into liquid is melting point.

(f) Boiling point - The temperature at which water boils and turns into vapour.

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Answer 2

1)Boiling:-Boiling is the rapid vaporization of a liquid, which occurs when a liquid is heated to its boiling point, the temperature at which the vapour pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding atmosphere.

2) Freezing :-The process through which a substance changes from a liquid to a solid. All liquids except helium undergo freezing when the temperature becomes sufficiently cold.

3.Melting :-Melting, change of a solid into a liquid when heat is applied. In a pure crystalline solid, this process occurs at a fixed temperature called the melting point; an impure solid generally melts over a range of temperatures below the melting point of the principal component.

4)Condensation :-Condensation is the change of the physical state of matter from the gas phase into the liquid phase, and is the reverse of vaporization. ... It can also be defined as the change in the state of water vapor to liquid water when in contact with a liquid or solid surface or cloud condensation nuclei within the atmosphere.

5) sublimation :-The term sublimation is the passage or the transformation or conversion that substances undergo when passing from one state to another, for example from a solid substance to gas. We can define sublimation as the transition of a substance from the solid phase to the gaseous phase without changing into the liquid phase.