(vertical) rise velocity, vf 

in flame emission and absorption spectrometry
https://doi.org/10.1351/goldbook.R05401
The vertical component of the velocity of the volatilized component in the observation space (in mm s−1). It depends on the flame temperature, the solute nebulized, the observation height and the gas flow rate.
Source:
PAC, 1986, 58, 1737. (Quantities and units in clinical chemistry: Nebulizer and flame properties in flame emission and absorption spectrometry (Recommendations 1986)) on page 1742 [Terms] [Paper]
Citation: '(vertical) rise velocity' 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.R05401 RIS BibTex EndNote
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Last revised: February 24, 2014