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Physics 7 Online
OpenStudy (anonymous):

it is observed that when a mercury in a glass thermometer is put in a flame the column of mercury first descends and then rises explain

OpenStudy (anonymous):

because first the mercury contracts, cause air will escape from the bottom of the mercury bulb, then unleashes it upward. After that, the mercury will heat up causing it to rise. Did I answered your question ma'am?

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