Matter in Our Surroundings
Chapter 1 of the Class 9 NCERT Science textbook opens with the states matter assumes and why. Learners compare the rigidity of solids, the flow of liquids and the compressibility of gases through particle arrangement and energy. Melting, boiling, sublimation and the cooling effect of evaporation are traced to heat and pressure, with latent heat explained plainly. Brief encounters with plasma and Bose-Einstein condensates hint at frontiers beyond the familiar three states, grounding everyday observations in particle theory.
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