Why is the surface of liquid always horizontal in the earth’s gravitational field ?

Scientific Reasoning : Why is the surface of liquid always horizontal in the earth’s gravitational field ?

Sol. As liquid cannot sustain shearing stress , so its surface always lies perpendicular to the force to which it is subjected . By knowing that the shearing force parallel to a liquid surface is always zero . A liquid is subjected to a vertical force in the earth’s gravitational field , so its surface is always horizontal .

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