Fluid flow | AP Physics | Khan Academy

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A difference in pressure between two locations causes a fluid to flow. Pressure differences can be created in various ways, such as removing air from one region (e.g., drinking through a straw) or maintaining a height of fluid (e.g., water towers). For an incompressible fluid, the rate at which matter enters a fluid-filled tube open at both ends must equal the rate at which fluid exits the tube. This conservation of mass is described by the continuity equation (A1v1 = A2v2).

Sections:
00:00 - Intro
00:26 - What makes a fluid flow?
00:59 - How does water rise in a straw?
04:23 - How does water flow in pipe systems?
05:44 - Continuity equation

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