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31 votes
18. The diagram below shows three flasks with three different liquids in each of them. hot water initial level of the liquid Liquid A Liquid B Liquid C The volume and temperature of the liquids in the flask are the same. All three flasks were placed inside a hot water trough. The level of the liquids increases. (a) (b) Why does the level of the liquids rises up? The liquids gain heat from the hot water, expand and move upwards Different liquids rises to a different level after heating. Explain the reason. Different liquids expand by different amounts when beated by the same temperature (c) Give one application of this expansion.​

User BigSandwich
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2 Answers

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11 votes

Different liquids have different rates of expansion. I think we can fairly say that (most) substances expand when heating because they vibrate more, because they have more kinetic energy, so there's a pushing force between molecules. For almost the same reason, gasses expand.The change in volume us independent of the original mass but depends on original volume.

A mercury thermometer is based on the application of thermal expansion of liquids. The bulb of the thermometer is kept in contact with a hot body, and mercury expands and level of mercury rises in the tube

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User Ilesh P
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20 votes
20 votes
Can u explain what you want
User Dr Schizo
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