BS 188:1977

Foreword
Cooperating organizations
Methods
Section one. General
1. Scope
2. References
3. Definitions
4. Units
Section two. Method using glass capillary viscometers
5. Field of application
6. Principle
7. Apparatus
8. Procedure
9. Calculation and expression of results
10. Repeatability and reproducibility
Section three. Falling sphere method
11. Field of application
12. Apparatus
13. Procedure
14. Calculation and expression of results
15. Repeatability and reproducibility
Appendices
A. Glass capillary viscometers
B. Poiseuille's law and correction for kinetic energy
C. Corrections to the viscometer factor C
D. Fall tubes
E. Mercury-in-glass thermometers
F. Timer calibration
G. Cleaning of apparatus
H. Note on derivation of units
Tables
1. Rates of fall for steel balls of different
     diameters in liquids of density 0.8 g/cm cubed
     and various viscosities
2. Typical Faxen correction factors
3. Values for Km and Kd
Figures
1. BS/U viscometer
2. Suspended-level viscometer, BS/IP/SL
3. Cannon-Fenske viscometer, BS/IP/CF
4. U-tube reverse flow viscometer for opaque liquids,
     BS/IP/RF
5. Reverse flow Cannon-Fenske viscometer, ISO/CF/RF
6. Falling sphere viscometer. Diagram of fall-tube and
     ball-releasing device, with alternative designs

Two methods, one using glass capillary viscometers and the other using falling sphere viscometers. Experimental procedures, formulae required and necessary corrections given for both methods.

This British Standard describes the determination of the viscosity of liquids by the method using glass capillary viscometers (section 2) and by the falling sphere method (section 3).

The standard applies only to liquids exhibiting Newtonian flow under the conditions of measurement. A test for Newtonian flow is described in each section.