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
\(\large{ \eta_r = \frac {\eta} {\eta_s}  }\)
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	\(\large{\frac{lbf - sec}{ft^2}}\)	\(Pa-s\)