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Standard fluid dynamics notation

In standard fluid dynamics notation:

<math> \Delta P = \frac{8 \mu L Q}{ \pi r^4} </math>

or

<math> \Delta P = \frac{128 \mu L Q}{ \pi d^4}</math>

or

<math> \Delta P = \frac{32 \mu L v}{ \ d^2}</math>

where:

<math>\Delta P </math> is the pressure loss

<math>L</math> is the length of pipe

<math> \mu </math> is the dynamic viscosity

<math>Q</math> is the volumetric flow rate

<math>r</math> is the radius

<math>d</math> is the diameter

<math> \pi </math> is the mathematical constant Pi

<math>v</math> is the velocity

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