Viscosity & Rheology Classroom

General Information

Articles & White Papers

Our scientists contribute to industry knowledge by authoring papers in various technical publications. See below for articles and white papers pertaining to:

In additional to technical articles and white papers, we offer a variety of short Application Proofs as examples of our testing capabilities. Our application scientists are available to discuss your particular application needs and help you find solutions to your most pressing testing issues.

Basic Viscosity
Shear Stress / Shear Rate = Viscosity

General
a = 9.801 m/s²

Dynamic Viscosity
1 poise = 1 g/cm·s = 0.1 N·s/m² = 0.1 Pa·s
1 cP = 1 mPa·s

SI Unit Conversion
1 Pascal = 1 Newton / m²

Kinematic Viscosity
1 Stoke = 1 cm²/s = 100 mm²/s
1 cSt = 1 mm²/s

Conversion from Rotational to Kinematic Viscosity
Poise / Density = Stoke
g/cm·s / g/cm3 = cm²/s

Conversion from Kinematic to Rotational Viscosity
Stoke * Density = Poise
cm²/s * g/cm3 = g/cm·s


Conversion from Kinematic to Saybolt Viscosity


Krebs Unit (for Thomas®-Stormer Viscometer)
Over the viscosity range of 200 to 2100 mPa·s (cP)
ln(KU) = 1.1187 + 0.8542*ln(0.1938v + 36) - 0.0443(ln(0.1938v +36))²

Over the viscosity range of 2100 to 5000 mPa·s (cP)
ln(KU) = 1.8118 + 0.596*ln(0.1938v + 36) - 0.0206(ln(0.1938v +36))²

Where KU is the viscosity in Krebs Units at 25°C
and v is the viscosity in mPa·s (cP) at 25°C