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? 
Definitions:
Catarrhal Stage
Inflammation of the mucous membranes.
Whooping Cough
A highly contagious respiratory tract infection characterized by severe coughing fits and a distinctive "whooping" sound when inhaling.
Pertussis
A highly contagious respiratory disease also known as whooping cough, caused by the bacterium Bordetella pertussis.
Sensitivity
Abnormal susceptibility to a substance.
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