# Relative Viscosity

Relative viscosity, abbreviated \(\eta_r\), is the ratio of the viscosity of a solution to the viscosity of a solution used.

## Relative Viscosity formula |
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\(\large{ \eta_r = \frac {\eta} {\eta_s} }\) | ||

Symbol |
English |
Metric |

\(\large{ \eta_r }\) (Greek symbol eta) = relative viscosity | \(\large{\frac{lbf - sec}{ft^2}}\) | \(Pa-s\) |

\(\large{ \eta }\) (Greek symbol eta) = viscosity of a solution | \(\large{\frac{lbf - sec}{ft^2}}\) | \(Pa-s\) |

\(\large{ \eta_s }\) (Greek symbol eta) = viscosity of a solution used | \(\large{\frac{lbf - sec}{ft^2}}\) | \(Pa-s\) |

Tags: Viscosity Equations