## Wikipedia - Faktor retardasi (id) Wikipedia - Retardation factor (en) Wikipedia - User talk:Jim1138 (en) Wikipedia - Współczynnik opóźnienia (pl) Wikipedia - معامل إعاقة (ar) Wikipedia - 保留因子 (zh) retardation factor, $$R_{\text{F}}$$

in planar chromatography
https://doi.org/10.1351/goldbook.R05353
Ratio of the distance travelled by the centre of the spot to the distance simultaneously travelled by the mobile phase: $R_{\text{F}}=\frac{b}{a}$ By definition the $$R_{\text{F}}$$ values are always less than unity. They are usually given to two decimal places. In order to simplify this presentation the $$hR_{\text{F}}$$ values may be used: they correspond to the $$R_{\text{F}}$$ values multiplied by 100. Ideally, $$R_{\text{F}}$$ values are identical to the $$R$$ values used in @[email protected]
Source:
PAC, 1993, 65, 819. (Nomenclature for chromatography (IUPAC Recommendations 1993)) on page 845 [Terms] [Paper]