Answer :

The length of the mercury column is balanced by the pressure and can be changed only with a pressure change. This is the principle of barometer. In case of an open column attached to a vacuum pump, we are decreasing the pressure within the column. Hence, the mercury will try to balance the pressure until the pressure inside equals the pressure outside (atmospheric pressure). This happens when we achieve vacuum like conditions in the tube. As now there is no pressure difference, the mercury cannot rise further in the tube.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

The weight of an HC Verma - Concepts of Physics Part 1

A solid float in HC Verma - Concepts of Physics Part 1

(a) PressurPhysics - Exemplar

An ideal fluid flPhysics - Exemplar

Streamline flow iPhysics - Exemplar

If water be used HC Verma - Concepts of Physics Part 1

Find the force exHC Verma - Concepts of Physics Part 1

Suppose the glassHC Verma - Concepts of Physics Part 1

Water level is maHC Verma - Concepts of Physics Part 1

At Deoprayag (GarHC Verma - Concepts of Physics Part 1