Ragita Academy

chapter-1                  Matter in our surrounding Matter- The substance that occupies the volume and mass is called matter. States of matter- 1. Solid 2. Liquid 3. Gas 4. Plasma 5. Bose Einstein condensate Charactersitcs of perticles of matter- 1. Particles of matter are in the state of continoues moment. 2. Particles of matter are attract each other.   etc. Change of states of matter- Solid to liquid-           Fusion Liquid to solid-        Freezing Liquid to gas –        vapourisation Gas to liquid-         condensation Gas to solid-           solidification Solid to gas-            sublimation Conversion of temperature-)

Class-9 Chapter-1 Matters in our surroundings. 1) What is matter? Ans.   Matter is anything that occupied space that have mass and volume and offer residence is called matter. OR...... Matter is anything that occupies mass and volume. OR..... We can say that anything that has occupies space and mass of can be felt by our one or more sense organ is called matter. NOTE- 1. The SI unit of mass is kilogram (kg). 2. The SI unit of volume is cubic meter (m 3 ). 3. The common unit of measuring volume is litre (L).        (1L=1dm 3 , 1L=1000mL, 1mL= 1cm 3 ) For example- Full form: 1. MKS- Metre Kilogram Second 2. CGS- Centi Gram Second 3. FPS- Foot Pound Second Classification of matter- 1. Solid 2. Liquid 3. Gas       Solid- solid has definite shape and volume. Liquid- Liquid has definite volume but not definite shape. Gas- Gas has neither definite shape nor definite volume. Characteristics of matter- Some important Characterist