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activity coefficient

Overview page. Subjects: Earth Sciences and Geography — Chemistry.

The ratio of chemical activity (i.e. the effective concentration, a) of a component in a solution, to the actual mole fraction (X) present in solution: (γ = a/X). Values for activities are...

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Aikin, Arthur

H. S. Torrens.

in Oxford Dictionary of National Biography

September 2004; p ublished online September 2004 .

Reference Entry. Subjects: Medicinal Chemistry; Geology and the Lithosphere. 1389 words.

Aikin, Arthur (1773–1854), natural scientist and author, was born on 19 May 1773 at Warrington, Lancashire, the eldest son of John Aikin (1747–1822) and his wife, Martha (c.1746–1830),...

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Allan, Thomas

[Anon.].

in Oxford Dictionary of National Biography

September 2004; p ublished online September 2004 .

Reference Entry. Subjects: Petrology; Mineralogy and Gems. 593 words.

Allan, Thomas (1777–1833), mineralogist, was born at Edinburgh on 17 July 1777, the eldest of ten children born to Robert Allan (1745–1818), a partner in Allan and Stewart, bankers and...

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anhydrite

Overview page. Subjects: Earth Sciences and Geography — Chemistry.

An important rock-forming anhydrous mineral form of calcium sulphate, CaSO4. It is chemically similar to gypsum but is harder and heavier and crystallizes in the rhombic form (gypsum is...

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argentite

Overview page. Subjects: Earth Sciences and Geography — Chemistry.

A sulphide ore of silver, Ag2S. It crystallizes in the cubic system but most commonly occurs in massive form. It is dull grey-black in colour but bright when first cut and occurs in veins...

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argon

Overview page. Subjects: Meteorology and Climatology — Chemistry.

A natural, colourless, odourless, inertgas that is the third most abundant constituent of dry air (it comprises 0.93% of the Earth's atmosphere).

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Babington, William

J. F. Payne.

in Oxford Dictionary of National Biography

September 2004; p ublished online September 2004 .

Reference Entry. Subjects: Petrology; Medicine and Health; Mineralogy and Gems. 970 words.

Babington, William (1756–1833), physician and mineralogist, the son of a clergyman, was born on 21 May 1756 at Portglenone, near Coleraine, co. Antrim, Ireland. After being apprenticed to a...

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barometric pressure

Overview page. Subjects: Chemistry — Meteorology and Climatology.

The pressure exerted by the atmosphere at a given place and time. It is often expressed in terms of the supported height of a column of mercury, usually measured in ...

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Bauerman, Hilary

T. K. Rose.

in Oxford Dictionary of National Biography

September 2004; p ublished online September 2004 .

Reference Entry. Subjects: Petrology; Mineralogy and Gems; Geology and the Lithosphere. 613 words.

Bauerman, Hilary (1835–1909), mineralogist and geologist, was born in London on 16 March 1835, the younger son in the family of two sons and one daughter of Hilary John Bauerman...

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Boase, Henry Samuel

Denise Crook.

in Oxford Dictionary of National Biography

September 2004; p ublished online September 2004 .

Reference Entry. Subjects: Medicinal Chemistry; Geology and the Lithosphere. 945 words.

Boase, Henry Samuel (1799–1883), geologist and chemist, was born at 6 Knightsbridge, London, on 2 September 1799, the third child of Henry Boase (1763–1827), a banker, and his wife, Anne,...

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