When the bulb of a thermometer is immersed in a boiling liquid why mercury

the rocker

New member
column first descend & then rises? Please write a short answer as i dont want the details but just the basics and i would be pleased if you could a very short but good answer i would appreciate it if the answer is written in 1 or 2 lines only

As i have to learn it easly thats why i want the short answers as i dont want long answers cuz if i want long answers i can go on other places but i want short answers and also plz write your answer instead of posting a link to a website

I need to learn it easly for my homework so use easy words and simple answer Thanks
 
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