Why does mercury rise up to a height of 76 cm in a glass tube vertically placed in an open vessel with mercury

Why does mercury rise up to a height of 76 cm in a glass tube vertically placed in an open vessel with mercury, from which air is pumped out?

The pressure of atmospheric air on the open surface of mercury in a vessel is transmitted in all directions according to Pascal’s law. In the tube at the level of the tube surface, the pressure is equal to atmospheric, and the pressure force is directed upward. Under the action of this force, the mercury in the tube rises to a level approximately equal to the normal atmospheric pressure – 760 mm.

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