IEC 61850 Tissue Database

## 691 Dimensionless Quantities
The standard has been supporting the dimensionless quantity "ppm".
Follow the modern practice of using a multiplier such as "mu" for 10 to the minus 6th power, then in the unit of measure field, create "L/L" and "g/g" to show that the measurement was obtained on a volumetric or a mass ratio basis.
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