When we heat a substance the energy of the molecules increases, they move away a bit more hence they occupy more space. In liquids molecules move more freely than in solids, when they are heated their movements increases more than in solids. A liquid expands more than solid. Similarly, gases expand more than liquids.
Heat always flows _______________ . | |||
Right Option : B | |||
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Heat can change the state from Solid to ______________________ . | |||
Right Option : B | |||
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Which of the following are correct ? (a) Heat can change the state from solid to liquid and from liquid to gas. (b) Gaps are left between lengths of railway tracks to allow expansion in summers. (c) If rails are fixed tightly, leaving no space for expansion or contraction, they will bend outward in summer.
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Right Option : D | |||
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