Question

Mercury kept in the refrigerator has length L. If taken out in atmospheric pressure condition, length remains the same due to?

Answer 1

If mercury kept in a refrigerator is taken out into atmospheric pressure conditions, its length remains the same due to the negligible thermal expansion of mercury at typical temperature ranges.
Mercury is known to have a very low coefficient of thermal expansion, which means it expands or contracts very little with changes in temperature. This property makes it suitable for use in thermometers and other applications where precise measurements are required.
When mercury is kept in a refrigerator, it reaches a temperature close to the refrigerator's set temperature. Upon taking it out into atmospheric pressure conditions, although the temperature of the surroundings may change, the expansion or contraction of mercury due to the change in temperature is minimal and can be considered negligible. Therefore, the length of mercury remains approximately the same when exposed to atmospheric pressure conditions.