CBSE Class 9 Science Classification Of Matter As Solid Liquid And Gas

Class 9 Science Classification Of Matter As Solid Liquid And Gas

In our last article for Class 9 we have studied about Matter and it characteristics. So the next topic in 9 Class science syllabus is classification of Matters viz, Solid, Liquid and Gas.

On the basis of physical states Matter can be classifies as Solids, Liquid and gas.

Eg:-Rock, Cold Drink, CNG Cylinder, Table, Glass, Cup, Book, Cooking Oil, Milk, Juice, etc.

So,we as per ‘9 class science‘ syllabus we are going to discuss this classification for better understanding.

Solid State:-If we will look around we will find many things around us which are rigid, having definite shape and volume and does not change their shape very easily, they all are Solids. Even if you are reading this content on your laptop or mobile it is also one of the examples of solid.

When applied force solid can break but it is very difficult to change their shape.

Characteristics of Solid:-

Fixed Shape and Definite Volume
Cannot be compressed
High density
Do not flow

Liquid State: – If I take 100 ml water in a glass and transfer the same in a dish and measure the quantity it will be same. But water will acquire the shape of container. Hence we can conclude that liquid has the definite volume but no fixed shape.

Characteristics of Liquid:-

Fixed volume but no fixed shape
Cannot be compressed much
Moderate to high densities
Flow easily

Gaseous State:-A cylinder is filled by gas, when the same gas is filled in balloon hundreds of balloon can be filled with the same gas in cylinder. Hence we conclude that gases are compressible and can change their shape and volume easily.

Characteristics of Gas:-

No fixed shape nor fixed volume
Can be compared easily
Very low density
Flow easily

So, Dear”9th class Science“students we have studied the characteristics of Solid, Liquid & Gas, now we will understand why solid,Liquid& Gas have different properties

Now, we will learn why do the properties differ for solid,liquid and Gas-this is because of the kinetic theory of Matter.

“According to the kinetic theory of matter, the particles of matter are in continuous motion and possess kinetic energy”.

As we have studied in last article that matter is made up of small particles which are connected by force of attraction and are in movement constantly. So, we conclude that following properties decide the state of matter:-

The Space between the particle-Solid have minimum space in their particles, a liquid has little more and maximum in gas.
The force of attraction between particle:-Solids have strongest force of attraction between the particles, little weak in liquids and negligible in gas.
Movement of particles:-Movement of particles is minimum in solids, more in liquid and maximum in gas.

So, above points define the structure of solid, liquid and gas. State of Matter can be changed in certain situations this we will discuss in our next article.

For viewing animated structure on Matter please visit Takshila Learning. For NCERT Solutions for Class 9 and CBSE question paper for Class 9.