Thomas Graham

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Thomas Graham

Thomas Graham 1805-69, Scottish chemist, best known for research in diffusion in both gases and liquids that led to his formulation of Graham's law. His discovery that certain substances (e.g., glue, gelatin, starch) pass through a membrane more slowly than others (inorganic salts, e.g., common salt, or sodium chloride) led him to draw a distinction between the two groups, calling the former (the slower) colloids and the latter crystalloids. In this connection he discovered dialysis. His work was the earliest in colloidal chemistry. His investigation of phosphoric acid led to the present chemical concept of polybasic acids.

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Graham, Thomas

World Encyclopedia | 2005 | Â© World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

Graham, Thomas (1805–69) Scottish chemist, best remembered for Graham's law, which states that the diffusion rate of a gas is inversely proportional to the square root of its density. This law is used in separating isotopes by the diffusion method and has industrial applications. He also discovered dialysis.

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