make a note which has all the points about class 9 science chapter 1 matter in our surroundings

Sure, here are the key points about Class 9 Science Chapter 1 - Matter in Our Surroundings:

1. Introduction to Matter: Matter is anything that occupies space and has mass. It is made up of particles.

2. Characteristics of Particles of Matter: Particles of matter have space between them, they are continuously moving and they attract each other.

3. States of Matter: Matter exists in three states - solid, liquid and gas. Solids have a fixed shape and volume. Liquids only have a fixed volume, but no fixed shape. Gases have neither a fixed shape nor volume.

4. Can Matter Change its State?: Matter can change from one state to another when the temperature or pressure changes. This is known as a change of state.

5. Evaporation: Evaporation is a surface phenomenon in which particles from a liquid state change into the vapour state.

6. Factors Affecting Evaporation: The rate of evaporation is affected by surface area, temperature, humidity and wind speed.

7. Effects of Evaporation: Evaporation causes cooling. This principle is used in our daily life for cooling, for example, in earthen pots, desert coolers, etc.

8. Sublimation: Some substances can change directly from solid to gas without changing into the liquid state, this process is known as sublimation.

Remember, these are just the key points. For a detailed understanding, you should read the full chapter and understand each concept thoroughly.