Question

Define the following terms:

1. Matter

2. States of matter

3. Solid

4. Liquid

5. Gas

6. Particles

7. Diffusion

8. Compressibility

9. Forces of attraction

10. Evaporation

Answer 1

1. Matter: Anything in this world that occurs space and has mass is considered as matter Ex: Water, food, air, tables, chairs, etc 
2. States of matter: Matter exists in three states. They are solids, liquids and gases. These three differ in their properties. 
3. Solid: Solids have a definite shape and ci fixed volume.
4. Liquid: Liquids can get their shape depending on the container. Liquids can flow easily from one container to another. Hence they are called fluids Ex: Water, milk, etc.
5. Gas: Gases neither have a fixed shape nor volume. Ex: Air, CNG, etc.
6. Particles: Matter is made up of tiny particles. Particle ¡s the smallest part of the matter.
7. Diffusion: The particles of matter move continuously in liquids and gases. This movement is called diffusion.
8. Compressibility: Large volume of gas ¡s compressed into cylinders of the small volume to make it portable. This property is called compressibility. (or) The reciprocal of the bulk modulus of the material.
9. Forces of attraction: The force of attraction between the particles is maximum in solids, intermediate in liquids and minimum in gases.
10. Evaporation: The phenomenon of change of a liquid into vapours at any temperature below its boiling point ¡s called evaporation.