9th Science NCERT Chapter 1
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– Particles of Matter Attract Each Other: The chapter discusses how particles of matter have forces of attraction between them, which vary from one kind of matter to another. This force keeps the particles together, and their kinetic energy increases with temperature【4:0†source】.
– States of Matter: Matter exists in three states – solid, liquid, and gas, each with varying characteristics of particles. Solids have a definite shape, liquids take the shape of the container, and gases have maximum kinetic energy and compressibility【4:1†source】.
– Evaporation: The chapter explains evaporation as a process where particles at the surface of a liquid gain energy, break away from the forces of attraction, and change into vapor. Factors affecting evaporation are also discussed, such as surface area, temperature, and humidity【4:3†source】.
– Melting and Boiling Points: The chapter covers the concepts of melting and boiling points, latent heat, and changes in states of matter. It explains how heat energy is absorbed during melting and boiling, leading to changes in the states of matter【4:4†source】.
Why does a desert cooler cool better on a hot dry day?
How does the water kept in an earthen pot (matka) become cool during summer?
Why does our palm feel cold when we put some acetone or petrol or perfume on it?
Why are we able to sip hot tea or milk faster from a saucer rather than a cup?
What type of clothes should we wear in summer?
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