73 / | HD | MEASURING AND TESTING |
53.01 | DF | LIQUID ANALYSIS OR ANALYSIS OF THE SUSPENSION OF SOLIDS IN A LIQUID {15} |
61.41 | DF | .~ Content or effect of a constituent of a liquid mixture {8} |
61.76 | DF | .~.~ By thermal measurement {1} |
61.77 | .~.~.~ Vaporization (e.g., evaporation, distillation, etc.) |