The Inherent Viscosity calculator computes the inherent viscosity based on the viscosity of the solvent and solute, the volume of the solution and the mass of the constituent mass of the solute.

INSTRUCTIONS: Choose units and enter the following:

• (η)  Viscosity of the solution.
• (η_s) Viscosity of the solvent
• (m_i) Mass of the solute
• (V) Volume of the solution

Inherent Viscosity (η_inh): The calculator returns the Inherent Viscosity in mL/g. 

The Math / Science

The Inherent Viscosity equation computes the Inherent Viscosity in mL/g, 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 formula for Inherent Viscosity is:

   η_inh = ln(η_rel) / c

This version of the Inherent Viscosity formula expands η_rel and c:

   η_inh = ln(η/ηs) /(m_i/V)

where:

• η_inh is the inherent viscosity
• m_i is the constituent mass of the solute
• V is the volume of the solution
• η it the viscosity of the solution
• η_s is  the viscosity of the solvent

See Also

• 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