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Mechanical Engineering

Viscous force per unit area Calculator

Mechanical Engineering

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Viscous force per unit area

Equation and meaning

\[\frac{F}{A} = \frac{\eta \cdot v}{r}\]

Use this equation when the shown variables describe your problem. Keep all inputs in compatible units; the calculator converts them to SI internally before solving.

Variables in this formula

A — Area
Area SI unit: m²
eta — Eta
Enter this value unless it is the selected unknown.
F — Force
Force SI unit: N
r — Radius
Radius SI unit: m
v — Velocity
Velocity SI unit: m/s

How to use this calculator

  1. Leave one value emptyThe empty field is automatically treated as the unknown.
  2. Enter known values and unitsChoose N, kgf, dyn, SI or another compatible unit when available.
  3. Review the automatic answerThe result appears immediately and is substituted back into the formula to check the residual.
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