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Encyclopedia > Boron oxide

Boron oxide is a colourless or white solid, also known as Diboron trioxide, formula B2O3. It is odourless.

Contents


Physical Properties

The molecular mass of a substance (less accurately called molecular weight and abbreviated as MW) is the mass of one molecule of that substance, relative to the unified atomic mass unit u (equal to 1/12 the mass of one atom of carbon-12). ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... KG, Kg or kg may indicate: A Kampfgeschwader, a bomber squadron of the former German Luftwaffe Basketball Player Kevin Garnett An abbreviation for kilogram (always kg) Knight of the Garter, a British decoration Kongo language (ISO 639 alpha-2) An abbreviation for konig or king Kwansei Gakuin University (Japan) [1... The melting point of a solid is the temperature at which it changes state from solid to liquid. ... The eleventh letter of the Latin alphabet, K comes from the Greek Κ or κ (Kappa) developed from the Semitic Kap, symbol for an open hand. ... The boiling point of a substance is the temperature at which it can change state from a liquid to a gas throughout the bulk of the liquid. ... The parameter used to describe the interaction of electromagnetic radiation with matter is the complex index of refraction, , which is a combination of a real part and an imaginary part. ...

Applications

The materials definition of a glass is a uniform amorphous solid material, usually produced when a suitably viscous molten material cools very rapidly, thereby not giving enough time for a regular crystal lattice to form. ... In a discussion of art or technology, enamel (or vitreous enamel, or porcelain enamel in American English) is the colorful result of fusion of powdered glass to a substrate through the process of firing, usually between 750 and 850 degrees Celsius. ... General Name, Symbol, Number boron, B, 5 Chemical series metalloids Group, Period, Block 13, 2, p Appearance black Atomic mass 10. ... Boron Carbide (chemical formula B4C) is an extremely hard ceramic material used in tank armor, bulletproof vests, and numerous industrial applications. ... Fiber Optic strands An optical fiber in American English or fibre in British English is a transparent thin fiber for transmitting light. ...

Average Daily Intake

The US National Institute of Health quotes this source: The National Institutes of Health is an institution of the United States government which focuses on medical research. ...

Total daily boron intake in normal human diets ranges from 2.1-4.3 mg boron/kg body weight (bw)/day. /Total boron/ Zook EG and Lehman J; J. Assoc. Off Agric. Chem. 48: 850-5 (1965)

Hazard Information

  • Australian Government information
  • [1] US NIH hazard information

  Results from FactBites:
 
Process for manufacturing boron nitride fiber batts using a spinner - Patent 4309203 (2424 words)
The compacted boron oxide fiber bundle thus produced is heated in an anhydrous ammonia atmosphere to convert boron oxide in the fibers into boron nitride (BN).
A process for producing non-woven, boron nitride fiber batts, comprises the steps of melting solid boron oxide and introducing the molten boron oxide into a rapidly spinning drum having a plurality of circumferentially arranged perforations, whereby the molten boron oxide is extruded through the perforations into a plurality of strands.
The nitriding phase involves the heating of the batt of boron oxide fibers in an ammonia (NH.sub.3) atmosphere, which is free of water vapor, because of the deteriorating effect of water on boron oxide.
Oxide - Wikipedia, the free encyclopedia (320 words)
Oxides containing only one oxygen are called oxide or monoxide, those containing two oxygen atoms dioxide, three trioxide, four tetroxide, and so on following the Greek numerical prefixes.
Oxides are characterized by a redistribution of electrons, in which the oxygen atoms have a net surplus of electrons and the other atoms a net lack.
Oxides of metals occur as ionic compounds, or salts, which are solid at room temperature.
  More results at FactBites »


 
 

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