The roof of a building has atmospheric air pressing it from all sides, with the result that net force acting on it because of atmospheric pressure is nil. However, if we were to make a building or a room, within which a vacuum was maintained, then the net atmospheric pressure acting on such a building will tend to press in the building from all sides, and therefore its roof as well as walls and floors will have to be made strong enough to withstand the atmospheric pressure.
We can demonstrate this effect of atmospheric pressure using the example of an empty carton of some soft drink. Normally such a carton does not collapse under atmospheric pressure. Bur if we such air our of the carton, and thereby reduce the air pressure inside the carton, it will collapse under influence of atmospheric air pressure.
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