Q. Mercury boils at 367${^\circ}$C.However,mercury thermometers are made such that they can measure temperature are made such that they can measure temperature upto 500${^\circ}$C.This is done by
A) Maintaining vacuum above 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
Explanation
(b) If we fill nitrogen gas at high pressure above mercury level, the boiling point of mercury is increased which can extend the range upto 500$℃$.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.