Question

why does the mercury not fall or rise in a clinical thermometer when taken out of the mouth​

Answer 1

Answer:

because when we keep it in our mouth it tracks our body temperature and so when we take out from mouth the mercury not fall or rise in a clinical thermometer

Answer 2

Answer:

Because the temperature is not very high or low.

Explanation:

We know that a metal expands on heating. In the above given situation, there is no increase or decrease in temperature, that's why Mercury doesn't fall or rise in a clinical thermometer when taken out of the mouth.

I hope it helps