hydrolysis ratio, \(r_{\text{w}}\)

https://doi.org/10.1351/goldbook.HT07623

mole ratio of water to alkoxy groups used in sol-gel processing of metal alkoxides.

Source:
PAC, 2007, 79, 1801. 'Definitions of terms relating to the structure and processing of sols, gels, networks, and inorganic-organic hybrid materials (IUPAC Recommendations 2007)' on page 1823 (https://doi.org/10.1351/pac200779101801)