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Question

Force can change the shape of an object. When water is poured into a container, it changes its shape into that of the container. Then, is there any force exerted by the bottle on the fluid so that it changes its shape?

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Solution

For any given point in a fluid, the pressure is the same in all directions, even sideways or pointing up. So for two points of equal depth the pressure is the same regardless of the shape of the container above it. This is a characteristic of liquids to take the shape of their container.
The atmospheric pressure (about 14.7 psi) is pushing down on the surface of the water in the tall tube and the deeper you go into the tube or container, the pressure is increased by 1 psi for every 2.31 feet of depth due to the weight of the water "above" pushing equally in all directions.

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