page 104 Appendix
Appendix
I Ranges of validity for the ring correction methods
The following table provides information about the range of validity of the correction
methods implemented in the K11. In order to select the suitable correction method for
your application you should find the line containing the density difference of the system
to be measured and check whether the expected surface or interfacial tension lies
within the range of validity for the correction method. If the expected value means that
several correction methods are possible then you should use that which provides the
greatest accuracy.
Range of validity of the correction method
(mN/m)
Density
difference (g/ml)
Zuidema & Waters Harkins & Jordan Huh & Mason
0.2 8 … 36 4 … 36 0.5 … 950
0.4 15 … 72 8 … 72 1 … 1900
0.6 23 … 108 12 … 108 1.5 … 2880
0.8 30 … 144 16 … 144 2 … 3840
1.0 37 … 180 20 … 180 2.5 … 4800
1.2 45 … 217 24 … 217 3 … 5760
1.4 52 … 250 28 … 250 3.5 … 6720
Accuracy +/- 0.38% +/- 0.08% +/- 0.19%
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