I bottled my hoppy wheat ale and hoppy wit today.
I forgot to measure the final gravity, but it was too late as I already put the priming sugar into the beer in the bottling bucket.
However, I needed to find the gravity of the beer after fermentation to find out the ABV.
Here is the answer I came up with by going back to the high school chemistry experiment.
The difference of the boiling point between different types of fluid.
Boiling point of Ethanol is 78℃, hence the Ethanol contained beverage, Beer has lower boiling point than the pure water.