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.
At 70 degrees Fahrenheit, one cubic foot of water weighs approximately 62.30 pounds. Keep in mind, however, that the density of water, and thus its weight by volume, fluctuates based on its temperature. Water that is warmer than 70 F weighs less, while water that is cooler than 70 F weighs more. Full Answer >.