Aluminum is important in all segments of the world economy. The use of aluminum exceeds that of any other metal except iron measured in both quantity and value. In 2009, 33 percent of the aluminum used in the United States was in the transportation industry for the manufacture of automobiles, trucks, railcars, marine vessels, and airplanes. Alloys have high tensile strengths and are of considerable industrial importance to the aerospace industry. Because of aluminum’s resistance to corrosion, low density, and excellent heat-conducting property, 26 percent of the aluminum was used by the packaging industry for drink and food containers and covers, and foil pouches and wraps in 2009. In 2009, the building construction industry used 14 percent of aluminum alloys in such items as gutters, panels, siding, window frames, and roofing. It is a good conductor of electricity and is widely used in power and telephone cables, light bulbs, and electrical equipment. Examples of the numerous other products containing aluminum and aluminum alloys are cookware, golf clubs, air conditioners, lawn furniture, license plates, paints, refrigerators, rocket fuel, and zippers.