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When it's cold, the molecules in the Mercury slow down and become more compact, leading to a decrease in volume. This reduction in volume results in the mercury level dropping in a thermometer.

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Q: Why does the mercury go down when its cold?
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Continue Learning about Natural Sciences

Why can a mercury thermometer be used only at high temperatures?

A mercury thermometer can go down to -30 deg C


Can Mercury sustain life form?

Life is not sustainable due to the extreme heat and/or cold. And also because of the atmosphere Mercury has.However you can go if you bring plenty of sunscreen and blankets.


What would a spacesuit be made out of to go to mercury?

you would wear a thermal or heated spacesuit because it is very cold at night and in the morning a cold suit because it is extremely hot in the daytime! good luck!


Which planet is very hot in the day time but very cold at night?

I think the planet you are thinking of is Mercury.


What are unique characteristic on Mercury?

Mercury is the closest planet to the sun.one side of mercury is hot(about 450 Celsius) the other side of the planet is cold(_180 celsius)