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Topic: Dalton (unit)


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In the News (Mon 16 Nov 09)

  
 John Dalton - Wikipedia, the free encyclopedia
Dalton communicated his atomic theory to Thomson who, by consent, included an outline of it in the third edition of his System of Chemistry (1807), and Dalton gave a further account of it in the first part of the first volume of his New System of Chemical Philosophy (1808).
Dalton died in Manchester in 1844 of paralysis.
Dalton had requested that his eyes be examined after his death, in an attempt to discover the cause of his colour-blindness; he had hypothesised that his aqueous humour might be coloured blue.
en.wikipedia.org /wiki/John_Dalton   (2534 words)

  
 Encyclopedia article on John Dalton [EncycloZine]   (Site not responding. Last check: 2007-10-10)
John Dalton (September 6, 1766–July 27, 1844) was a British chemist and physicist, born at Eaglesfield, near Cockermouth in Cumberland.
Dalton received his early education from his father and from John Fletcher, a teacher of the Quaker school at Cumberland, on whose retirement in 1778 he himself started teaching.
Many of Dalton's ideas were acquired from other chemists at the time such as Lavoisier and Higgins, however he was the first to put the ideas into a universal law of atomic theory, undoubtedly his greatest achievement.
encyclozine.com /John_Dalton   (1920 words)

  
 Molecular_mass
The molecular mass (abbreviated MM) of a substance, 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).
Due to this relativity, the molecular mass of a substance is commonly referred to as the relative molecular mass, and abbreviated to Mr.
The molar mass of a substance is numerically equal to the molecular mass, but expressed in mass units per mole, usually as g/mol (grams per mole).
www.brainyencyclopedia.com /encyclopedia/m/mo/molecular_mass.html   (489 words)

  
 Pharmaceutical biomolecules
Unit of mass equal to the unified atomic mass (atomic mass constant).
If a part or the whole of the molecule has a high relative molecular mass and essentially comprises the multiple repetition of units derived, actually or conceptually, from molecules of low relative molecular mass, it may be described as either macromolecular or polymeric, or by polymer used adjectivally.
Ratio of the mass of a molecule to the unified atomic mass unit.
www.genomicglossaries.com /content/biomolecules.asp   (1884 words)

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