Here's an interesting article that says what used to be the three-legged stool of retirement (Social Security, pensions and personal savings) is now a four-legged stool of retirement (Social Security, employer retirement plans, home equity and work.) We'll start with their thoughts on Social Security:
One liter of water weighs 1 kg., and 1 gallon of water is equal to 3.7854118 liters; therefor, 1 gallon weighs 3.7854118 kg, which is 8.345404487293294 pounds. Fresh water is take 39.2 degrees Fahrenheit . 1 gallon of fresh water is about 8.36 pounds (Gallon of water weigh calculator). For US: 128 ounces to a gallon, about 30 g/ounce (memory says 29.6g/oz but I would not trust my life on it.) 128*29.6g = 3788.8g = 3.788.8 Kg *2.2lb/kg about = 8.33lb.
One pint of water weighs one pound (1.04316 lbs/pint). One gallon of water weighs 8.3453 pounds. One cubic foot of water contains 7.48052 gallons. The weight of one cubic foot of water is 7.48052 gallons times 8.3453 pounds, which equals62.42718356 pounds of water per cubic foot. One cubic foot contains 1728 cubic inches.