Question

why does the mercury level of thermometer rise up when it is placed in a hot water and fall down when it is placed in a cold water? ​

Answer 1

When heated, the molecules of the liquid in the thermometer move faster, causing them to get a little further apart. This results in movement up the thermometer. When cooled, the molecules of the liquid in the thermometer move slower, causing them to get a little closer together.

Answer 2

Answer:

because of the molecules present in the tube...

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