In the U.S. it is still (thankfully) the standard unit of measurement for gasoline (i.e., petrol), heating oil etc. How did we end up with the gallon? What was the basis for it as a unit for measuring the volume of liquids?
Think first, then research, then THINK again. Think for the pleasure of thinking.
Yesterday’s ‘Think’: “What Is Under Your Feet, A Few Thousand Miles Down” — at all times, wherever you are, there will be be at least 7,900 miles of ‘earth’ BELOW you! That actually happens to be the diameter of the Earth, 7,917.5 miles to be exact. The interior of the Earth, as you must remember from somewhere, is layered — like an onion (albeit without too many layers). There is the topmost ‘crust’, the main crust per se, the mantle, the liquid outer core and then the extremely solid, inner core. It is worth looking up. Google it “earth’s interior”.