# Resistance Coefficient

Resistance coefficient, abbreviated as K, a dimensionless number, is how much resistance to the flow an obstacle has. This is the opposite of flow coefficient which is how much flow capacity an obstacle allows.

## Resistance Coefficient formula |
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\(\large{ K = f_d \; \frac {l} {d} }\) | ||

Symbol |
English |
Metric |

\(\large{ K }\) = resistance coefficient | \(\large{dimensionless}\) | |

\(\large{ f_d }\) = Darcy friction factor | \(\large{dimensionless}\) | |

\(\large{ d }\) = inside diameter of pipe | \(\large{in}\) | \(\large{mm}\) |

\(\large{ l }\) = lenght of pipe | \(\large{ft}\) | \(\large{m}\) |

\(\large{ i }\) = \(\large{ \frac{l}{d} }\) = equivalent length of the obstruction | \(\large{dimensionless}\) |