flow rate

of a quantity
https://doi.org/10.1351/goldbook.F02441
Quantity \(X\) (e.g. heat, amount, mass, volume, ...) transferred in a time interval divided by that time interval. General symbols: \(q_{X}\), \(\overset{.}{X}\).
Source:
Green Book,2nd ed., p. 65 (https://www.cintegrado.com.br/site/documentos/green_book_2ed.pdf)