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Continuity Equation

Definition

The continuity equation states that the mass flow rate of a fluid is constant in a closed system, meaning that the amount of fluid entering a section must be equal to the amount leaving it.

Analogy

Imagine a crowded hallway with people moving at different speeds. The continuity equation is like saying that no matter how fast or slow people are walking, the number of people entering and exiting the hallway must be the same at any given time.

Related terms

Fluid Dynamics: The study of how fluids (liquids and gases) behave when they are in motion.

Conservation of Mass: The principle stating that mass cannot be created or destroyed, only transferred or transformed.

Flow Rate: The volume of fluid passing through a particular point per unit time.

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AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.