On Tuesday, when my wife noticed his she called the plumbers. She then called me to ask what the volume of the water heater is. I said that I thought it was 50 gallons. That is correct, but I had never looked at the information on the heater; rather, about fifty years ago I heard fifty gallons mentioned as the volume of a particular water heater, and have since supposed most domestic ones to be of that size.
In trying to come up with a better justification, I thought, Suppose that the tank is sixteen inches across and five feet high. Then roughly speaking
- The cross-section is 20 cm x 20 cm x pi, or roughly 1260 square centimeters
- Five feet is 1.5 meters, 150 cm, giving the volume around 190000 cubic centimeters, 190 liters, a bit under 50 gallons.