Why is Alcohol Content Referred to as Proof?

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Today I Found Out
Published at : 16 Nov 2020
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In this video:

The process began in England around the 16th century. Its original purpose was not consumer protection, but rather to ensure that the state (read: the King) collected the proper amount of taxes on the sale of the product (alcohol, called proof spirits, was taxed at a higher rate).

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Sources:

https://en.wikipedia.org/wiki/Absinthe
http://www.bbc.com/culture/story/20140109-absinthe-a-literary-muse
https://en.wikipedia.org/wiki/Alcohol_by_volume
http://www.andygreenlaw.com/posts/alcohol-volume-popular-whiskeys-vodka-gin-rum/
https://en.wikipedia.org/wiki/Alcohol_proof
http://gizmodo.com/5935493/five-scientifically-surprising-facts-about-booze
https://en.wikipedia.org/wiki/Specific_gravity
https://socratic.org/questions/which-liquid-water-or-alcohol-has-stronger-intermolecular-forces
https://au.answers.yahoo.com/question/index?qid=20080908002250AArnUDu
https://www.britannica.com/demystified/why-is-alcohol-measured-by-proof
https://www.quora.com/Why-is-ethanol-less-dense-than-water
http://www.wormwoodsociety.org/index.php/102-news-and-information/items/187-yes-real-absinthe-is-legal-in-the-us

Image Credit:

https://www.bigstockphoto.com/ru/image-161074391/stock-photo-pouring-whiskey-from-bottle-to-two-glasses-with-ice-cubes%2C-served-on-wooden-planks-vintage-countertop-with-keg-and-glasses-of-hard-liquor
https://www.bigstockphoto.com/ru/image-81827957/stock-photo-higher-taxes
https://www.bigstockphoto.com/ru/image-163217642/stock-photo-alcohol-burns-in-a-plate-of-blue-red-flame-in-a-plate-on-a-dark-background
https://www.bigstockphoto.com/ru/image-108225452/stock-photo-martini-glass-with-purple-drink-is-on-fire-and-very-hot
https://www.bigstockphoto.com/ru/image-111888110/stock-photo-scientific-researcher-holding-a-distilled-purified-deionised-water-in-plastic-bottles-with-a-pump
https://www.bigstockphoto.com/ru/image-146814071/stock-photo-rejected-illustration-on-toned-background-rejected-business-concept-on-toned-background-rejected-file-folder-on-working-table-rejected-concept-3d-render
https://www.bigstockphoto.com/ru/image-178442452/stock-photo-rules-and-regulations-golden-gears-rules-and-regulations-on-mechanism-of-golden-gears-3d-rendering
https://www.bigstockphoto.com/ru/image-131304113/stock-vector-banned-red-grunge-round-vintage-rubber-stamp-banned-stamp-banned-round-stamp-banned-grunge-stamp-banned-banned-vintage-stamp
https://www.bigstockphoto.com/ru/image-80541530/stock-photo-blackboard-with-the-chemical-formula-of-thujone

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