Types of Matter Solids: Shapes and Particles

Key Concepts

• Solids 
• Shapes 
• Particles 

Introduction and Explanation: 

When we enter any room, we see lots of things which are of different shapes and different types.  

Identify all the different shapes from this picture and understand how did they get their shape. 

The wall clock is circular. 

A blackboard is rectangular. 

Each object has different shapes, called solids. 

SOLIDS: 

• Solid is a substance that has its own shape and size.     

• The particle in it cannot move freely as it is closely packed.   

• Solids have tiny particles.  

• Solids can attain their shape when particles are closely packed and there should be no free spaces between the particles. 

Solid 

Activity: 

Take an apple and a knife. 

As the apple is solid and to the apple, we need another solid object: a knife. 

So, solids will be used with solid objects only. 

Now list down all the solids that you see around you: 

Summary:

• Solids have definite shapes and sizes.
• In solids, particles are tightly packed.
•  Particles in the objects are very free.
• Few examples of solids: Bag, Chair etc.