An difríocht idir athruithe ar: "Dlí Boyle"

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==Stair==

Thug [[Richard Towneley]] agus [[Henry Power]] an gaol seo idir brú agus toirt faoi deara den chéad uair sa 17ú haois.<ref>See:

* Henry Power, ''Experimental Philosophy, in Three Books'' … (London: Printed by T. Roycroft for John Martin and James Allestry, 1663), pp. 126–130. Available on-line at: [https://quod.lib.umich.edu/e/eebo/a55584.0001.001/155?page=root;size=125;view=text Early English Books Online]. On page 130, Power presents (not very clearly) the relation between the pressure and the volume of a given quantity of air: "That the measure of the Mercurial Standard, and Mercurial Complement, are measured onely by their perpendicular heights, over the Surface of the restagnant Quicksilver in the Vessel: But Ayr, the Ayr's Dilatation, and Ayr Dilated, by the Spaces they fill. So that here is now four Proportionals, and by any three given, you may strike out the fourth, by Conversion, Transposition, and Division of them. So that by these Analogies you may prognosticate the effects, which follow in all Mercurial Experiments, and predemonstrate them, by calculation, before the senses give an Experimental [eviction] thereof." In other words, if one knows the volume V₁ ("Ayr") of a given quantity of air at the pressure p₁ ("Mercurial standard", i.e., atmospheric pressure at a low altitude), then one can predict the volume V₂ ("Ayr dilated") of the same quantity of air at the pressure p₂ ("Mercurial complement", i.e., atmospheric pressure at a higher altitude) by means of a proportion (because p₁ V₁ = p₂ V₂).