tan $\delta$ (n.)

in thermal analysis
https://doi.org/10.1351/goldbook.12309
The dimensionless ratio of energy lost to energy returned during one cycle of a periodic process.
Example: \(\tan \delta = E^{\prime\prime}/E^{\prime}\) in dynamic mechanical analysis (DMA).
Source:
PAC, 2014, 86, 545. (ICTAC nomenclature of thermal analysis (IUPAC Recommendations 2014)) on page 549 [Terms] [Paper]
Citation: 'tan $\delta$ (n.)' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.12309 RIS BibTex EndNote
Div. ITextXMLJSON