Irrespective of shape of vessels or containers, a connected liquid maintains same level in all containers.
This happens to maintain same pressure at a given depth. As the pressure depends on depth of a point from the liquid surface.
Why is echo not heard in our living rooms? To hear echo, the minimum distance between the source and the reflector must be 17m. When this distance is more than 17m, the reflected sound can be distinguished from the original. As the length of our rooms is less than 17m, we don't hear echo.
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