CBSE PDF Notes

Matter In Our Surroundings Class 9th PDF Notes – Chapter 1

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2 months ago

06/15/2023

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Matter In Our Surroundings Class 9th PDF Notes – Chapter 1 Matter can be classified as solid, liquid, and gas on the basis of inter-particle forces and the arrangement of particles. These three forms of matter are inter-convertible by increasing or decreasing pressure and temperature. For example, ice can be converted from a solid to a liquid by increasing the
temperature.

Property	Solid	Liquid	Gas
Shape and volume	Fixed shape and volume	No fixed shape but has volume	Neither definite shape nor volume
Energy	Lowest	Medium	Highest
Compressibility	Difficult	difficult early	Easy
Arrangement of molecules	Regular and closely arranged	Random and little sparsely arranged	Random and more sparsely arranged
Fluidity	Cannot flow	Flows from higher to lower level	Flows in all directions
Movement	Negligible	Depends on interparticle attraction	Free, constant and random
Inter-particle space	Very less	More	Large
Inter-particle attraction	Maximum	Medium	Minimum
Density	Maximum	Medium	Minimum
Rate of diffusion	Negligible	It depends on interparticle attraction.	Maximum