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More than 5000 entries on the history, culture and life of Britain (published in 1993 by Macmillan, now out of print)
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Thomas Graham
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(1805–69) Pioneer in the chemical study of colloids (mixtures in which one substance is suspended in another) and in the processes which he called osmosis and dialysis. Graham's Law, named after him, states that the rate of diffusion of a gas is inversely proportional to the square root of its density.
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