Aluminum is the most abundant metallic element in the Earth's crust. Bauxite ore is the main source of aluminum. Aluminum is used in automobiles and airplanes (36%), bottling and canning industries (25%), building and electrical (14%) and in other applications (25%).
A: The average propane consumption per year for whole-house heating is estimated to be between 1200 and 1500 gallons per year for a 2,200 square foot home. However, the amount of propane a household uses varies depending on its specific uses in the household.
Household electricity use: 6,000 kWh per household per year for 3 residents average per household. So the household use per capita is 2,000 kWh or about of per capita electricity from all applications. Household Natural Gas use: 400 therms per household x 30 give 12,000 kWh equivalent electricity.Since much of the electricity is generated by natural gas, it is not totally unreasonable to compare these two in kilowatt hours.The EPA quotes 50% to 80% savings.) (You can get a 30% tax credit up to $2,000 until Jan. 1, 2008 on a solar water system.) With an average of 400 therms total gas usage, the water heating portion average is on average 50% at 200 therms. Saving 2/3 of this cuts out 200*(2/3)*30=4000 kWh.