Inherent Viscosity

The Inherent Viscosity calculator computes the inherent viscosity based on the relative viscosity and the mass concentration.

INSTRUCTIONS: Enter the following:

• (η_R) Relative Viscosity
• (c) Mass concentration

Inherent Viscosity (η_inh): The calculator returns the inherent viscosity.

The Math / Science

The formula for the Inherent Viscosity is:

 η_inh = ln(η_rel) / c

where:

•  η_inh is the inherent viscosity
•  η_R is the relative viscosity (unit-less ratio)
•  c is the mass concentration

The Inherent Viscosity equation is the ratio of the natural logarithm of the relative viscosity to mass concentration.  Inherent Viscosity is a viscometric method for measuring molecular size.  Inherent Viscosity can be measured by comparing the flow time of a polymer solution flowing through a narrow capillary to the flow time of a pure solvent through the same capillary.

The relative viscosity if the ration of the viscosity of a solution (η) to the viscosity of the solvent (η_s) in that solution.  The formula for Relative Viscosity is:

   η_R = η / η_s 

where:

• η_R = relative viscosity
• η = viscosity of solution
• η_s = viscosity of solvent

• Reduced Pressure
• Reduced Temperature
• Reduced Specific Volume
• Reduced Properties Calculator
• Critical Temperatures and Pressures (data set)
• Critical Temperature (liquid-vapor)
• Inherent Viscosity
• Inherent Viscosity[mi, V, eta, eta_s]
• Relative Viscosity
• Mass Concentration