It meant it could catch fire at 100 proof if mixed with gunpowder.
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.
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%.
the higher the proof the stronger - more alcohol - there is. In the UK 70 dgree proof was the standard strength of whiskey - 40% alcohol. 100 proof is 57.1% alcohol. 175 proof is 100% alcohol. In the USA it is different. 100 proof would be 50% alcohol, 70 proof would be 35% alcohol. 200proof would be 100% alcohol. ie double
Alcohol is flammable because it contains carbon and hydrogen atoms that can undergo combustion reactions. When alcohol is exposed to an ignition source such as a flame, heat causes the alcohol vapors to ignite and burn, creating a visible flame.
proof is double the alcohol percentage. 40% alcohol= 80 proof
the proof is used to tell you how much alcohol is in it. 100 proof is about 50% alcohol so jsut divide the proof by 2 the higer the proof the more alcohol
50% alcohol Proof ÷ 2 = % alcohol
Proof. Which is basically 2x the percent of volume that is alcohol. I believe it was called proof because in the past bar keeps would water down whisky and only patrons could ask for "proof" by attempting to burn the alcohol. if it didn't burn it had been watered down. and alcohol burns at roughly 80 plus proof, which is the ideal proof for hard alcohol such as whiskey, vodka, rum, and so on...
Alcohol proof is double the actual percentage of alcohol. 100 proof is 50% alcohol, 80 proof is 40%, and 65 proof is 32.5%
'Proof' is a unit of measurement equal to 1 half of 1 percent. Therefore, 150 proof is 75% Alcohol by Volume (although at this point, you're more likely drinking moonshine or grain alcohol and not whiskey)
Alcohol is measured in proof. 100% proof whiskey is 50% alcohol. Everclear is 95% alcohol.
100% pure alcohol is 200 proof. So 100 proof is 50% alcohol.