General Knowledge - Physics - Discussion

Different reasons for this and they are listed below:.

It is liquid across a very broad temperature range, making it very versatile.

It is metal, and thus has a relatively stable coefficient of expansion, and it only needs one calibration temperature.

It has a fairly high coefficient of expansion, making the slightest change in temperature very visible and thus making it excellent for use in analog displays (i.e. A physical thermometer).

It does not cling to the sides of tube. It has a visible meniscus.

Unlike water it does not expand upon solidification and will not break the glass tube. It has a high boiling point of 357 degree celsius.

Hi I guess some people want to say option A but by mistake they are writing it as option C as they are giving the explanation of specific heat which is option A not C.

I think correct answer is option A.

It is very confusing because someone's comments are A option and other one is C.

Which one is right?

At least anybody can write a better answer.

I also think it is confusing. Since both A, C based on the explanation.

My option is also "C" because of it great visibility whereby mercury can also show the less like 11.

C is the correct answer.

Mercury can be seen compared to water. Because of its silvery colour.

The answer is mercury is used in barometer because of having a higher density than water as we required a huge tube in case of water.

The same reason why it is used in thermometer is the high coefficient of expansion and bright visibility.

But the options given above have no coefficient of thermal expansion. So the answer is Visibility.

Liquid Mercury has a very low vapor pressure than water. So it will be more sensitive than water to the changes in the atmospheric pressure and ups faster to store the changes.

Mercury is used in thermometers because it has high coefficient of thermal expansion. So, any slight change of temperature is easily noticed and also it is clearly visible in glass tube as compared to water.