About 1980, the United States Postal Service detached the two-thirds of greater Oxon Hill that was furthest from Washington, D.C. and re-defined that part as a new postal designation, Fort Washington, MD.
A gallon of paint is heavier than a gallon of water. Mostly anything that mixes a solid into the water will be heavier than water. Most homes have a can of Spackle , which is a common liquid for patching drywall and it is almost twice as heavy as water. Of course,mercury is the heaviest liquid, but isn't common around the house anymore. But if you have a mercury switch for turning on your furnace, then that would be the heaviest common liquid by far. Which, I assume, discounts mercury - oil is lighter than water, so two choices would be sugar water or salt water.
U.S. Liquid Gallon: Imperial gallon is heavier than U.S. Liquid gallon. U.S. gallon measure around 3.785 liters and approximately 231 cubic inches. The Liquid expands and contracts at a specific temperature, so overcoming the expansion and contraction for a gallon we should know how much a gallon will occupy at a specific temperature for the trade purposes it is very important.