Question
Physics Question on Thermal Expansion
Mercury boils at 367°C However, mercury thermometers are made such that they can measure temperature upto 500°C. This is done by
A
maintaining vacuum aboves mercury column in the stem of the thermometer
B
filling nitrogen gas at high pressure above the mercury column.
C
filling oxygen gas at high pressure above the mercury column.
D
filling nitrogen gas at low pressure above the mercury column.
Answer
filling nitrogen gas at high pressure above the mercury column.
Explanation
Solution
The correct option is (B): filling nitrogen gas at high pressure above the mercury column..