The conductivity of copper and electric copper is second only to silver and higher than other metal materials, so it is used as the standard to detect the conductivity of raw materials. Copper not only has excellent conductivity, but also has high melting point (1083 ℃), good physical properties, corrosion resistance, reliability in work and long service life. It is the most widely used conductive raw material. Copper, which is used in power engineering, electronic device and household appliance industry and other main purposes, is generally refined to 99.98% or higher purity. The common transmission line at home is No. 14 copper transmission line. The diameter of copper conductor is 1.63mm and the section is 2.08mm. The length of No. 14 copper transmission line consumed by Britain every year can circle the earth's equator 3670 times, which is equivalent to 196 round trips to the moon or sunlight. Experts from the international copper technology professional research association believe that selecting copper transmission lines with large cross-section can not only improve the credibility of distribution equipment routes and reduce the scalding and working voltage damage of transmission lines, but also be very beneficial from the perspective of economic development. The research results show that the cost of improving the cross-section of transmission line can be compensated by the saved water and electricity charges within one to two years, and then it can benefit in the long term. Copper and transportation tools a car generally consumes about 23kg copper, three fifths of which are used for circuit system and two fifths for other equipment. The auto industry is increasingly using fast cutting red copper to produce and process parts. The automotive industry in the UK alone consumes about 40 million pounds of raw materials numbered c36000 every year. The average copper consumption of a large tractor transported by an agricultural vehicle is about 29kg, the average copper consumption of an engineering construction transport vehicle is 30kg, and the average copper consumption of an induction shovel truck is 63kg. The world's largest electric scraper uses 36.32 tons of copper. 2% of the net weight of Boeing 747-200 jetliner is copper (about 4100Kg), and the common copper transmission line is 190km long. A diesel locomotive needs 5 tons of copper. Each electric locomotive and tram in the subway station of the traction belt of electric engineering uses 284kg to 4 tons of copper, with an average of 1044kg. Each tritium driven strategic nuclear submarine needs 91 tons of copper.