If you like beer, please take a moment to appreciate and thank the humble #hydrometer
. Without the the hydrometer, how would you know just how much achohol a pint is delivering to your central nervous system?
A hydrometer "is an instrument used for measuring the relative density of liquids based on the concept of buoyancy. A reading is taken before and after fermentation and approximate alcohol content is determined by subtracting the post fermentation reading from the pre-fermentation reading." (source @wikipedia
Whoa! That's dense!