the refractive index is measured
121Pyridine — Pyridine …
122Mathematical descriptions of physical laws — For worded descriptions and criteria of physical laws, see Physical law. For the nomenclature used see Physical quantity and Defining equation (physics). Physical laws are often summarized by a single equation, or at least a small set of… …
123Magnesiohastingsite — from Bratislava, Slovakia. Specimen size 4.5 cm General Category Amphibole …
124Ethanol — For other uses, see Ethanol (disambiguation). Grain alcohol redirects here. It is not to be confused with Neutral grain spirit. Ethanol …
125Calcite — A one inch Calcite Rhomb that shows the Double image refraction property. General Category Carbonate mineral …
126Poly(methyl methacrylate) — This article is about the transparent plastic sometimes called acrylic glass. For the glass/plastic laminate often called safety glass , see laminated glass. Poly(methyl methacrylate) …
127Ripeness in viticulture — Grapes ripening on the vine. The term ripeness in viticulture can mean different things to different viticulturists and winemakers. At its broadest definition it refers to the completion of the ripening process of wine grapes on the vine which… …
128Diamond — This article is about the mineral. For the gemstone, see Diamond (gemstone). For other uses, including the shape ◊, see Diamond (disambiguation) …
