reid vapor pressure
31History of timekeeping devices — For thousands of years, devices have been used to measure and keep track of time. The current sexagesimal system of time measurement dates to approximately 2000 BC, in Sumer. The Ancient Egyptians divided the day into two 12 hour periods, and… …
32Ecology — For other uses, see Ecology (disambiguation). Ecology …
33Phase (matter) — In the physical sciences, a phase is a region of space (a thermodynamic system), throughout which all physical properties of a material are essentially uniform.[1] Examples of physical properties include density, index of refraction, and chemical …
34Viscosity — For other uses, see Viscosity (disambiguation). Viscosity The substance above has lower viscosity than the substance below SI symbol: μ, η SI unit: Pa·s  …
35Mother 3 — This article is about the Game Boy Advance game. For the cancelled Nintendo 64 game it was based on, see EarthBound 64. Mother 3 Japanese box art showing the game logo, whose structure of wood and metal was meant to convey uneasiness and… …
36David A. Johnston — David A. Johnston, 13 hours before his death at the 1980 eruption of Mount St. Helens Born …
37William Heirens — Infobox Serial Killer name= William Heirens caption=Mug shot of William Heirens. birthname= William George Heirens alias= The Lipstick Killer birth= November 15, 1928 location= Evanston, Illinois death= cause= victims=3 country=U.S. states=… …
38Sea surface temperature — Weekly average sea surface temperature for the World Ocean during the first week of February 2011, during a period of La Niña …
39D. B. Cooper — A 1972 F.B.I. composite drawing of D. B. Cooper Other names Dan Cooper Occupation Unknown Known for …
40Ignaz Semmelweis — Dr. Ignaz Semmelweis, aged 42 in 1860 pen sketch by Jenő Dopy …
