differential technique (adj.)

in thermal analysis
https://doi.org/10.1351/goldbook.12290
Pertaining to a difference in measured or measurable quantities usually between a sample and a reference or standard material.
Source:
PAC, 2014, 86, 545. (ICTAC nomenclature of thermal analysis (IUPAC Recommendations 2014)) on page 547 [Terms] [Paper]