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Vinony

rarefaction

noun

  1. The act of decreasing the density/pressure of
L326363 on Wikidata ↗

Wiktionary

noun

Etymology: From Middle French raréfaction. By surface analysis, rarefy + -faction.

  1. A reduction in the density of a material, especially that of a fluid.

    “[T]his ſeal'd vial, being broken under water, ſuck'd in a conſiderable quantity of it, whether, becauſe of ſome little rarefaction of the Air included in the ſealing, or becauſe of the infrigidation of that Air by the ſnow, or for both theſe Reaſons, or any other, I ſhall not Now diſpute.”