physical quantity (measurable quantity)

https://doi.org/10.1351/goldbook.P04666
An attribute of a phenomenon, body or substance that may be distinguished qualitatively and determined quantitatively.
Sources:
Green Book,2nd ed., p. 3 (https://www.cintegrado.com.br/site/documentos/green_book_2ed.pdf)
VIM (https://www.iso.org/standard/45321.html)