Q15. How can we say that metal and liquid expand
on heating.
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Answer:
Metal railway tracks have small gaps so that when the sun heats them, the tracks expand into these gaps and don't buckle. Liquids expand for the same reason, but because the bonds between separate molecules are usually less tight they expand more than solids.
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hey mate plz mark as best answer
Explanation:
When a solid is heated, its atoms vibrate faster about their fixed points. The relative increase in the size of solids when heated is therefore small. Metal railway tracks have small gaps so that when the sun heats them, the tracks expand into these gaps and don't buckle.
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