Class 3rd - Science
1. Detailed Introduction
Everything we see, touch, or feel around us is called Matter. The book you are reading, the water you drink, and the air you breathe are all made up of matter. Matter occupies space and has weight.
The Three Main States of Matter
Matter exists in three different physical forms or states. Let's learn about them:
- 1. Solids: Solids have a fixed shape and a fixed size. They do not change their shape easily when moved from one place to another. Examples: Pencil, stone, book, toy, and wood.
- 2. Liquids: Liquids do NOT have a fixed shape, but they have a fixed volume. They take the shape of the container they are poured into. Liquids can flow easily. Examples: Water, milk, juice, and oil.
- 3. Gases: Gases have NO fixed shape and NO fixed size. They spread out and fill all the available space around them. Most gases are invisible to our eyes. Examples: Air, oxygen, smoke, and water vapor.
Interchange of States (Changing Forms)
Matter can change its form from one state to another upon heating or cooling. Water is a perfect example that can exist in all three states:
Ice (Solid) --[On Heating]--> Water (Liquid) --[On Heating]--> Steam/Vapor (Gas)
2. Solved Examples (10 Conceptual Questions)
3. Practice Exercise (15 Questions)
Click the "Show Answer" button to cross-check your answers:
4. Interactive Practice Quiz (15 Questions)
Select your option, use Next/Previous to navigate, and click Submit at the last question to see your score card and step-by-step review solutions:
5. Printable Materials Center
Chapter 1 Premium Revision Worksheet
Download the standard Class 3 homework sheet containing state classification charts, fill-in-the-blanks, and diagram-labeling exercises on states of matter.
Download Worksheet PDF