Conclusions
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1.
The error in calculating kinematic viscosity from (12) is considerably lower than 1% forE>1.1 and it attains 1% only for E=1.1. This error does not exceed the measurement error of an Engler viscosimeter.
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2.
Formula (10) is the most convenient and precise for values of E>2.5. This formula can be recommended for converting the Engler arbitrary viscosity to kinematic viscosity for values of E>2.5.
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Martens, B.K. Evaluation of the precision of formulas for converting arbitrary viscosity values. Meas Tech 9, 671–674 (1966). https://doi.org/10.1007/BF00975227
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DOI: https://doi.org/10.1007/BF00975227