702 / | HD | DATA PROCESSING: MEASURING, CALIBRATING, OR TESTING |
1 | DF | MEASUREMENT SYSTEM IN A SPECIFIC ENVIRONMENT {6} |
22 | DF | .~ Chemical analysis {6} |
23 | DF | .~.~ Quantitative determination (e.g., mass, concentration, density) {3} |
24 | .~.~.~ Gaseous mixture (e.g., solid-gas, liquid-gas, gas-gas) |