When there is a water shortage in your locality you immediately called up to the water tanker department and issued a water tanker. But do you wonder why they are only spherical shaped, not square nor any shape. There is a deep scientific concept behind it.
You had studied in your class 8 science book that water exerts pressure on the walls of the container. And in rectangular and square shapes there are edges and vertices and water exerts pressure on boundaries and corners of the tanker. But in the spherical shapes there are no edges nor vertices and water unable to find a place to exert its pressure
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