Describe the processes involved in changing of a gas into a liquid and further a liquid into a solid. Explain the conditions briefly.
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Solution
Changes in states of matter:
A change of state is a physical change in a matter.
They are reversible changes and do not involve any changes in the chemical composition of the matter.
Changing states of matter occur involves exchange/transfer of energy.
When a substance absorbs energy, their atoms and molecules move more rapidly and this increased kinetic energy pushes particles far enough that they change state. This energy is usually heat or thermal energy.
The process involved in changing of a gas into a liquid and further a liquid into a solid:-
Condensation:
The process by which gas changes into the liquid state at a constant temperature by releasing heat is known as the condensation.
Example: Rain Falling Down, Morning Dew on the Grass, Steamy Bathroom Mirror etc.
Freezing:
The process by which a substance’s liquid state changes into its solid state at a constant temperature by releasing heat is called freezing, and the fixed temperature is known as the freezing point.
Example: Freezing of water to form ice in an ice cube tray, Conversion of dew drops into frost, etc.
Solidification:
It is a process by which a substance changes from liquid to solid state on cooling.
