What will happen to the height (h)of the mercury column in the manometer shown below if the stopcock is opened, given that the atmospheric pressure is 755 mmHg?
A)h will decrease
B)h will not change
C)h will increase
D)not enough information given to answer the question

Question

What will happen to the height (h)of the mercury column in the manometer shown below if the stopcock is opened, given that the atmospheric pressure is 755 mmHg? 
A)h will decrease 
B)h will not change 
C)h will increase 
D)not enough information given to answer the question

Quizplus · Accepted Answer

When the stopcock is opened, the pressure inside the flask will equalize with the atmospheric pressure, causing the pressure on the left side of the manometer to decrease. This decrease in pressure will result in a decrease in the height of the mercury column on the left side of the manometer, meaning h will decrease.

What Will Happen to the Height (H)of the Mercury Column