Matter in our surroundings
Anything that occupies space and has mass is known as matter.
Matter is not continuous but rather consists of large number of particles.
Characteristics of Particle
Large number of particles constitutes matter.
Particles of matter are very small in size.
Particles of matter have spaces between them
Particles of matter are continuously moving
Solids have definite shape, distinct boundaries and fixed volume
Liquids have fixed volume but no fixed shape.
Gases neither have fixed shape nor volume.
Solids possess least compressibility.
Liquids possess higher compressibility than solids.
Gases possess highest compressibility as compared to solids and liquids.
The process in which a solid changes to liquid state by absorbing heat at constant temperature is called fusion.
The temperature at which a solid melts to become a liquid at the atmospheric pressure is called as melting point.
SI unit of temperature is Kelvin. T (K)= T (oC) +273
The hidden heat which breaks the force of attraction between the molecules during change of state is called latent heat.
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NCERT 9 Science