Matter

Synopsis
1. Horse, mango tree, dog, animals, plants are living, while stone, pen, glass, water, book, table, air are non-living.

2. All the above mentioned things living and non-living are matter.

3. Energies like light, sound, heat are not matter, as these have no mass.

4. Matter: “Anything that has mass and occupies space is called matter.” Matter (mass) remains same at all places.

5. Molecules of matter are in motion.

6. The things which are similar in one or more ways are grouped together and this practice is classification.

7. There are inter-molecular gaps (spaces) and inter-molecular attraction (force of attraction) between molecules.

8. Solids are rigid, have definite volume, retain their shape and are in-compressible.

9. Liquids can flow, have definite volume but have no definite shape. Have only one free surface.

10. Gases Have no definite volume, no definite shape can flow are compressible.

11. Inter-molecular force: Solids > Liquids > Gases.

12. Inter-molecular volume: Solids < Liquids < Gases.