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CAS No 7782-40-3 , methane

  • Name: methane
  • Synonyms: Aquadag; Marsh gas;Carbon;methane; Biogas; Activated charcoal; CARBON BLACK; Fire Damp; Methyl hydride; Graphite;
  • CAS Registry Number:
  • Melting Point: 3727 C
  • Boiling Point:
    Vapour density:
  • EINECS: 231-953-2
  • Molecular Weight: 16.04246
  • InchiKey: VNWKTOKETHGBQD-UHFFFAOYSA-N
  • InChI: InChI=1S/CH4/h1H4
  • Molecular Formula: CH4
  • Molecular Structure:CAS No:7782-40-3 methane

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References of methane
Title: Diamond
CAS Registry Number: 7782-40-3
Literature References: A crystalline form of carbon. Mined as a mineral, principally in South Africa. (Non-commercial) synthesis from other carbon compds (e.g., lignin) by means of elevated temperatures (about 2700°) and pressures (about 800,000 lbs/sq inch): Desch, Nature 152, 148 (1943); Neuhaus, Angew. Chem. 66, 525 (1954); Hall, Chem. Eng. News 33, 718 (1955); Bridgman, Sci. Am. 1955, 46; Hall, J. Chem. Educ. 38, 484 (1961); Bundy, Ann. N.Y. Acad. Sci. 105, 951-982 (1964). Books: S. Tolansky, History and Use of Diamond (London, 1962) 166 pp; R. Berman, Physical Properties of Diamond (Oxford, 1965) 442 pp.
Properties: Face-centered cubic crystal lattice. Burns when heated with a hot enough flame (over 800°, oxygen torch). d425 3.513. nD20 2.4173. Hardness = 10 (Mohs' scale). Sp heat at 100 K: 0.606 cal/g-atom/K. Entropy at 298.16 K: 0.5684 cal/g-atom/K. Band gap energy: 6.7 ev. Dielectric constant 5.7. Electron mobility: ~1800 cm2/v-sec. Hole mobility: 1200 cm2/v-sec. Can be pulverized in a steel mortar. Attacked by laboratory-type cleaning soln (potassium dichromate + concd H2SO4). In the jewelry trade the unit of weight for diamonds is one carat = 200 mg. Ref: Wall Street J. 164, no. 36, p 10 (Aug 19, 1964).
Index of refraction: nD20 2.4173
Density: d425 3.513
Use: Jewelry. Polishing, grinding, cutting glass, bearings for delicate instruments; manuf dies for tungsten wire and similar hard wires; making styli for recorder heads, long-lasting phonograph needles. In semiconductor research.