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