tie-line

synonyms: connodal, conodal
https://doi.org/10.1351/goldbook.15367
Straight line connecting compositions of independent coexisting phases in equilibrium on a phase diagram.
Source:
PAC, 2008, 80, 233. (Glossary of terms related to solubility (IUPAC Recommendations 2008)) on page 270 [Terms] [Paper]