| Aluminium content | Chemical composition of flows | Units of mass | kg |
| Aluminum (E) | Technical flow properties | Units of mass | kg |
| Aluminum oxide (Al2O3) (E) | Technical flow properties | Units of mass | kg |
| Antimony content | Chemical composition of flows | Units of mass | kg |
| Antimony in alloy (E) | Technical flow properties | Units of mass | kg |
| Antimony oxide (Diantimony trioxide) (Sb2O3) (E) | Technical flow properties | Units of mass | kg |
| Area | Technical flow properties | Units of area | m2 |
| Areatime | 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 |
