Why the column of mercury first descends and then rises when the bulb of thermometer is placed over flame?
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When mercury in a glass thermometer is put in a flame, does the column of mercury first descend and then rise? It might. ... In that interval, the volume inside the bulb will increase faster than the volume of the mercury will, causing the mercury column to drop briefly before the mercury heats up.
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because of the warm temperature the mercury rises
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