Even average compositions such as Natoire's Mark Antony set or Van Loo's Theseus looked great as tapestries, and de Troy's immensely popular Esther and Medea... sets provide one of the high points of the French School association with Gobelins. (apollo-magazine.com)
Rather than using «bulk» geochemistry techniques that measure the average composition of a rock, Mars 2020 is developing new capabilities including X-ray fluorescence and Raman spectroscopy to map the elemental, mineral, and organic composition of rocks at high spatial resolution, with analytical spot sizes about the width of a human hair. (sciencedaily.com)
Tools available to study these reactions can only provide information on the average composition of electrodes at any given point in time. (sciencedaily.com)