The proof number is twice the percentage of the alcohol content measured by volume, Therefore '80 proof' is 40% alcohol by volume.
The measure of the percentage of alcohol in drinks is widely believed to have started in the 18th century, when alcohol and gunpowder would be mixed together, if the combination lit when a flame was applied, it would be considered to have 'proved' it was a strong alcohol. (This is where the term 'firewater' is believed to have come from.) Originally that was considered 100 proof and was actually 50% alcohol, but more sophisticated measures since then have established that this alcohol and gunpowder mix would ignite if there was at least 57% alcohol, not 50%.
It's 70 proof. Therefore, 35% is its alcohol content. Alcohol content is: proof divided by 2
1 ounce = 28.3495 grams; 200 alcohol proof = 100% alcohol content. 2 ounces of 80 proof (40% alcohol) whiskey would be 56.699 grams of whiskey with 22.6796 grams of pure alcohol.
Proof is always double the actual alcohol content of a given product. A seventy proof vodka would contain 35% of pure (100%) ethanol.
100% pure alcohol is 200 proof. So 100 proof is 50% alcohol.
The proof is 50 per cent of the alcohol content. 80 proof is 40% alcohol.
The alcohol content of Goldschlager is 43.5% or 87 proof. Originally the alcohol content was 53.5% or 107 proof. It is a liquer with tiny flakes of gold that float within the liquid, but which only measure up to 13mg per litre.
Dewar's whiskey has a 40% alcohol/volume, it is 80 proof.
It's a 100 proof alcohol, and 50% alcohol content.
40 proof alot
90 proof means the alcohol content is 45%, by volume.200 proof = 100%180 proof = 90%and so on.
Hydrometers are commonly used to assess or determine actual proof of an alcoholic beverage. One half the proof is the alcohol content. For example, 80 proof whiskey is 40% alcohol. The alcohol conent in blood is measured by analyzing a sample of blood. More commonly, it is estimated (not measured) by using an alcohol breath testing machine, one brand of which is the Breathalyzer.
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.