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Graham's law

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noun

the principle that the rates of diffusion and effusion of a gas are inversely proportional to the square root of its density, proposed by Thomas Graham (1805-69) in 1831

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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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