If any liquid is flowing in a pipe of cross-section area, then rate of flow of liquid across any cross-section remains constant.
Principle of Continuity of State
According to the equation of continuity states that if any liquid is flowing in streamline flow in a pipe of non-uniform cross-section area, then rate of flow of liquid across any cross-section remains constant. In the Principle of Continuity of State, Av = constant.
Where A refers to cross-sectional area and v is the velocity in which the fluid flows. It means
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