| SI.Volume | V_liquid | | Volume |
| SI.Volume | V | | Total volume |
| SI.Volume | V_wall | | Wall volume |
| SI.Length | level | | Liquid level |
| SI.Height | level_meas | level - level_0 | Measured fluid level (level - level_0) |
| Units.NonDim | level_meas_percentage | 100*(level_meas - level_meas_min)/(level_meas_max - level_meas_min) | Percentage full based on max/min level |
| SI.Area | surfaceArea_WL | | Wall-Liquid surface area |
| SI.Area | surfaceArea_VL | | Vapor-Liquid interfacial area |
| SI.Area | surfaceArea | | Internal wall transfer area |
| SI.Area | surfaceArea_outer | | Outer wall transfer area |
