Gb Qv Essays Proofs Of Alcohol

After four months, 40 posts and thousands of comments from readers, it’s just about closing time. At least for now.

To cap this round of Proof, four contributors have offered brief dispatches from their drinking lives.

This post will be followed at week’s end by “Last Call: Readers Speak,” a selection of of some of the most insightful and entertaining comments submitted over the course of the series.

Proof will open for business again. We’ll let you know when.


Alexander Nazaryan

I did not pick a good month to visit the Hemingway Bar at the Ritz Hotel in Paris, one of the most expensive drinking establishments in the world. It was February, enthusiasm from the presidential inauguration had waned, and the European model of gentle socialism was looking more attractive by the day. I figured that while I still had the vestiges of a bank account, I might as well squander it on a week of the good life on the banks of the Seine.

So there I was at the Ritz, where the side car was perfected by the legendary mixologist Frank Meier in 1923. It can be had, with 1834 cognac, for about $1,000. Most cocktails, with names like Platinum Bullet and Death in the Afternoon, are closer to $50; I thought that the menu, decorated with photographs of Hemingway, would make a wonderful souvenir. It would indeed, the bar agreed, for a mere $7. When the bill for myself and a companion came after two rounds of drinks, I regretted not using the money to purchase a controlling share of Citigroup. Read more…

Posts by Alexander Nazaryan

Alcohol proof is a measure of the content of ethanol (alcohol) in an alcoholic beverage. The term was originally used in the United Kingdom and was equal to about 1.75 times the alcohol by volume (ABV). The UK now uses the ABV standard instead of alcohol proof. In the United States, alcohol proof is defined as twice the percentage of ABV.

The measurement of alcohol content and the statement of content on bottles of alcoholic beverages is regulated by law in many countries.


The term proof dates back to 16th century England, when spirits were taxed at different rates depending on their alcohol content. Spirits were tested by soaking a pellet of gunpowder in them. If the gunpowder could still burn, the spirits were rated above proof and taxed at a higher rate.[1] As gunpowder would not burn if soaked in rum that contained less than 57.15% ABV, rum that contained this percentage of alcohol was defined as having 100 degrees proof.[2] The gunpowder test was officially replaced by a specific-gravity test in 1816.[1]

From the 18th century until 1 January 1980, the UK measured alcohol content by proof spirit, defined as spirit with a gravity of ​1213 that of water, or 923 kg/m3, and equivalent to 57.15% ABV.[3]

The value 57.15% is very close to the fraction ​47 = 0.5714. This lead to the definition amounts to declaring that 100° proof spirit has an ABV of ​47. From this it follows that, to convert the ABV (expressed as a percentage standard rather than as a fraction) to degrees proof, it is only necessary to multiply the ABV by ​74 . Thus pure, 100% alcohol will have 100×(​74) = 175° proof, and a spirit containing 40% ABV will have 40×(​74) = 70° proof.

The proof system in the United States was established around 1848 and was based on percent alcohol rather than specific gravity. 50% alcohol was defined as 100 proof.[1]

The use of proof as a measure of alcohol content is now mostly historical. Today, liquor is sold in most locations with labels that state its alcohol content as its percentage of alcohol by volume (ABV).

Governmental regulation[edit]

European Union[edit]

The European Union follows recommendations of the International Organization of Legal Metrology (OIML). OIML's International Recommendation No. 22 (1973)[4] provides standards for measuring alcohol strength by volume and by mass. A preference for one method over the other is not stated in the document, but if alcohol strength by volume is used, it must be expressed as a percentage (%) of total volume, and the water/alcohol mixture must have a temperature of 20 °C (68 °F) when measurement is done. The document does not address alcohol proof or the labeling of bottles.

United Kingdom[edit]

Since 1 January 1980, the United Kingdom has used the ABV standard to measure alcohol content, as prescribed by the European Union.

In common with other EC countries, on 1 January, 1980, Britain adopted the system of measurement recommended by the International Organisation of Legal Metrology, a body with most major nations among its members. The OIML system measures alcohol strength as a percentage of alcohol by volume at a temperature of 20 °C. It replaced the Sikes system of measuring the proof strength of spirits, which had been used in Britain for over 160 years.[3]

Britain, which used to use the Sikes scale to display proof, now uses the European scale set down by the International Organization of Legal Metrology (OIML). This scale, for all intents and purposes the same as the Gay-Lussac scale (GL) previously used by much of mainland Europe, was adopted by all the countries in the European Community in 1980. Using the OIML scale or the GL scale is essentially the same as measuring alcohol by volume except that the figures in the latter case are expressed in degrees, not percentages and measured at a temperature of 15 °C .[5]

United States[edit]

In the United States, alcohol content is measured in terms of the percentage of alcohol by volume. The Code of Federal Regulations (27 CFR [4-1-03 Edition] §5.37 Alcohol content) requires that liquor labels must state the percentage of ABV. The regulation permits, but does not require, a statement of the proof provided that it is printed close to the ABV number.[6] For bottled spirits over 100 mL containing no solids, actual alcohol content is allowed to vary within 0.15% of ABV stated on the label.[3] Alcohol proof in the United States is defined as twice the percentage of alcohol by volume. Consequently, 100-proof whiskey contains 50% alcohol by volume; 86-proof whiskey contains 43% alcohol.[3] In the United States the term "degrees proof" is normally not used. For example, 50% ABV would be described as "100 proof" rather than "100 degrees proof".

Example: Everclear (alcohol) is 95% Alc. by Vol./190 Proof.


Canada labels by percentage of alcohol by volume.[7] The old UK proof standard was still in use as late as 1972.[8]

See also[edit]


  1. ^ abcJensen, William. "The Origin of Alcohol "Proof""(PDF). Archived from the original(PDF) on 8 July 2014. Retrieved 17 July 2014. 
  2. ^"Alcohol "Proof" and "Alcohol by Volume": Definitions and Explanations". 
  3. ^ abcdScotch Whisky: Questions and Answers, Section 6. Scotch Whisky Association.
  4. ^Recommendation No. 22, International Alcoholmetric Tables(PDF). 
  5. ^Regan, Gary (2003). The Joy of Mixology. New York: Clarkson Potter. pp. 356–357. ISBN 0-609-60884-3. 
  6. ^Title 27 Alcohol, Tobacco and Firearms, Chapter 1, §5.37. Bureau of Alcohol, Tobacco and Firearms; Department of the Treasury. p. 62. 
  7. ^Canadian Food Inspection Agency - Alcoholic Beverages
  8. ^Drug Library: Canadian Government Commission - Alcohol, item 61
A bottle of 151 proof ("over-proof") rum

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