The mercury pools in the bulb, but when it heats up, it expands. Because it can't expand through the bottom of the bulb, it is forced up the tube. That expansion, caused by the atoms flying around faster and taking up more space, is what makes the thermometer work.
Answers & Comments
Question:.
It tells how far the mercury goes up and down
AnSwER:
The mercury pools in the bulb, but when it heats up, it expands. Because it can't expand through the bottom of the bulb, it is forced up the tube. That expansion, caused by the atoms flying around faster and taking up more space, is what makes the thermometer work.
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