| Roscoe, Sir Henry | <person> British chemist, 1833-1915. See: Bunsen-Roscoe law. (05 Mar 2000) |
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| Roscoe-Bunsen law | In two photochemical reactions, e.g., the darkening of a photographic plate or film, if the product of the intensity of illumination and the time of exposure are equal, the quantities of chemical material undergoing change will be equal; the retina for short periods of exposure obeys this law. Synonym: reciprocity law, Roscoe-Bunsen law. (05 Mar 2000) |
| roscoelite | <chemical> A green micaceous mineral occurring in minute scales. It is essentially a silicate of aluminia and potash containing vanadium. Origin: From an English chemist, H.E. Roscoe. Source: Websters Dictionary (01 Mar 1998) |