| Ag_wt | Quantities / Technical quantities / material content | Unit of mass | kg |
| Aluminium content | Chemical composition of flows | Units of mass | kg |
| Antimony content | Chemical composition of flows | Units of mass | kg |
| Area | Technical flow properties | Units of area | m2 |
| Area*time | Technical flow properties | Units of area*time | m2*a |
| Argon content (mass) | Chemical composition of flows | Units of mass | kg |
| Arsenic content | Chemical composition of flows | Units of mass | kg |
| Ash_wt | Quantities / Technical quantities / material content | Unit of mass | kg |
| As_wt | Quantities / Technical quantities / material content | Unit of mass | kg |
| Au_wt | Quantities / Technical quantities / material content | Unit of mass | kg |