Even if the condition of water on the earth seems rest, if we look at the fluid particles condition in molecular level or atomic level, fluid particles might be in the condition rotational vortex motion around themselves or in the condition equivalent to rotational motion around themselves, and they act centrifugal forces or equivalent forces to them on the fluid particles vertical upward (radial outward) and their weight of masses that directs vertical downward (radial inward) is supported vertical upward (radial outward) and balanced everywhere all around at every depth along the radial line on the earth.

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A Study on the Improvement of Performance of Axial Flow Pump
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