Question

The vertical height of mercury which a simple barometer can support at sea level is :

a. 76 cm c.) less than 76 cm

b. More than 76 cm d.) none of these​

Answer 1

Answer:

Answer is C.

The mercury level in the tube of the barometer falls until it is about 76cm(760mm) vertically above the mercury level. It is the atmospheric pressure acting on the surface of the mercury in the trough that supports the vertical mercury column.

The atmospheric pressure is therefore specified by so many millimetres of mercury. For example, the atmospheric pressure is 760mm Hg at sea level.

Hence, The vertical height of mercury which a simple barometer can support at sea level is less than 76 cm.