What will happen to the height (h)of the column of mercury in the manometer shown below if the stopcock is opened?
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 column of mercury in the manometer shown below if the stopcock is opened? 
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 decrease and air will enter, causing the level of the liquid in the manometer to change. In this case, since the pressure in the flask is decreasing, the height (h) of the column of mercury in the manometer will also decrease.

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