It is a way to check sobriety. If you are unable to divide the proof by 2 and get the alcohol content its either time to stop drinking or go back to school.
100% pure alcohol is 200 proof. A liquid containing 10.5% alcohol would thus be 21 proof
No, ninety proof whiskey is not thirty percent alcohol. In the United States, proof is defined as twice the percentage of alcohol by volume (ABV). Therefore, ninety proof whiskey contains 45% alcohol by volume.
Proof is a measure of the alcohol content in a beverage, with the proof value being twice the percentage of alcohol by volume (ABV). Therefore, a drink that is 20 proof contains 10% alcohol by volume. This means that in a 100 ml serving, there are 10 ml of pure alcohol.
151/2 = 75.5% try not to drink too much, as this contains nearly twice as much alcohol per shot as vodka and more than twice that of most rums.
"Proof" means the accumulation of evidence which brings you to the conclusion that a statement is true. "Proof" also is a way of measuring alcohol content of spirits, being twice the percentage of alcohol in the spirit.
In the U.S., proof equals twice the percentage of alcohol in the beverage. In the UK, and several European countries, the 'proof' of alcohol is not given, it is stated as a percentage of volume. However this is somewhat misleading. Pure alcohol, which would be 100% alcohol, very difficult to produce, would be classed as 200 proof. Confusing to the uninitiated. All spirit drinks sold retail in the UK must state their alcohol by volume and not their 'proof'.
"Alcoholic proof is a measure of how much alcohol (i.e., ethanol) is contained in an alcoholic beverage. The measure is commonly used in the United States, where it is defined as twice the percentage of alcohol by volume."Source: http://en.wikipedia.org/wiki/Alcoholic_proof
In the United States, the "proof" descriptor for a bottle of liquor is defined as twice the percentage of alcohol by volume. Thus, a bottle labeled as "100 proof" will consist of 50% alcohol-content.
The "Proof" of an alcoholic beverage is an indicator of it's alcohol content on a 200 point scale. Take the Proof # and divide it by 2 to find out what the percentage is. So, to answer you specific question, 86/2= 43. Therefore 86 proof alcohol is 43 percent alcohol.
The answer varies in each different liquor, and should be listed on the bottle as "proof". The "Proof" is twice the alcohol percentage, so 40 proof is 20% alcohol, 180 proof is 90% alcohol.
In the United States, the alcohol-by-volume proof measurement equates to twice the percentage of alcohol content. If a beverage contains 28% alcohol by volume, it would be considered to be 56 proof.
London proof strength is a measure of the alcohol content in spirits, defined as twice the percentage of alcohol by volume (ABV). Therefore, 100 percent alcohol would have a proof strength of 200 proof, as it contains the maximum concentration of alcohol possible. This system is primarily used in the United Kingdom and is less common in other regions, where different proof systems may apply.