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PHYSICS / FLUID DYNAMICS

Fluid Continuity Speed Calculator

Calculate downstream speed for steady incompressible flow through changing area. See the governing equation, substituted values, result, assumptions, and interpretation in one guided workspace.

  • 01 Calculated in this tab
  • 02 Values stay in this browser tab
  • 03 Use boundary

Conversion input

Known value

Filter by unit name, symbol, or code. Your current selections remain available.

Equation inputs

Preparing the calculator...

Use boundary

Calculation path

Calculate downstream speed for steady incompressible flow through changing area. The page evaluates the displayed equation from your supplied values and presents both symbolic and substituted KaTeX working so the arithmetic can be checked.

Calculation path

A1v1=A2v2

What you provide

What you provide

  • Upstream area expressed in m^2, using the same scenario as the other inputs
  • Upstream speed expressed in m/s, using the same scenario as the other inputs
  • Downstream area expressed in m^2, using the same scenario as the other inputs

What you receive

What you receive

  • Downstream speed in m/s from the stated equation
  • A symbolic formula plus substituted working with your values
  • Visible assumptions, field guidance, and an authoritative learning reference

Use boundary

Choose the maximum decimal places shown. This does not increase source accuracy.

Flow is steady and incompressible with no branch, leak, or storage between sections.

Use internally consistent units and retain extra precision when carrying the result into another calculation.

Reviewed reference factors

Reviewed reference factors

OpenStax University Physics

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