The ratio of the difference between the viscosities of solution and solvent to the @V06627@ of the solvent, i.e. \(\eta _{i} = \frac{\eta - \eta _{\text{s}}}{\eta _{\text{s}}}\), where \(\eta \) is the @V06627@ of the solution and \(\eta _{\text{s}}\) is the @V06627@ of the solvent. The use of the term 'specific @V06627@' for this quantity is discouraged, since the @R05282@ increment does not have the attributes of a specific quantity.