powdered graphite
51Fire classes — Comparison of fire classes American European Australian/Asian Fuel/Heat source Class A Class A Class A Ordinary combustibles Class B Class B Class B Flammable liquids Class C Class C Flammable gases Class C UNCLASSIFIED Class E …
52GIRD — Russian Group of Study of Reactive Motion (in Russian: Группа изучения реактивного движения (ГИРД), transliterated GIRD) was a Soviet research bureau founded in 1931 to study various aspects of rocketry, which was later incorporated into the… …
53Plutonium — (pronEng|pluːˈtoʊniəm, symbol Pu, atomic number 94) is a rare radioactive, metallic chemical element. The most significant isotope of plutonium is 239Pu, with a half life of 24,100 years; this isotope is fissile and is used in most modern nuclear …
54Tracy Hall — Howard Tracy Hall (October 20, 1919 ndash; July 25, 2008) was an American physical chemist and the first person who grew a synthetic diamond according to a reproducible, verifiable and witnessed process, using a press of his own design.Early… …
55boron — boronic /boh ron ik, baw , beuh /, adj. /bawr on, bohr /, n. Chem. a nonmetallic element occurring naturally only in combination, as in borax or boric acid, and obtained in either an amorphous or a crystalline form when reduced from its compounds …
56chemistry — /kem euh stree/, n., pl. chemistries. 1. the science that deals with the composition and properties of substances and various elementary forms of matter. Cf. element (def. 2). 2. chemical properties, reactions, phenomena, etc.: the chemistry of… …
57molybdenum processing — Introduction preparation of the ore for use in various products. Molybdenum (Mo) is a white, platinum like metal with a melting point of 2,610° C (4,730° F). In its pure state, it is tough and ductile and is characterized by moderate… …
58Ceramic matrix composite — Fracture surface of a fiber reinforced ceramic composed of SiC fibers and SiC matrix. The fiber pull out mechanism shown is the key to CMC properties …
59Ammonium perchlorate composite propellant — (APCP) is a modern solid rocket propellant used in both manned and unmanned rocket vehicles. It differs from many traditional solid rocket propellants such as black powder or Zinc Sulfur, not only in chemical composition and overall performance,… …
60torchon — A tightly rolled paper stump, or stomp, used for drawing with powdered pigment such as charcoal or graphite. (pr. tohr shaw ) Also called a tortillon …
