Boyle's law

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Boyle's law

 [boilz]
at a constant temperature the volume of a perfect gas varies inversely with pressure; that is, as increasing pressure is applied, the volume decreases. Conversely, as pressure is reduced, volume is increased.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

Boyle's Law

the principle that the pressure of a gas varies inversely with its volume at a constant temperature. Named after Robert Boyle (1627–91).
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005