Txawm hais tias lub caij tooj liab qeb tsuas yog 26th hauv kev nplua mais, calcium, tooj liab, tooj liab yog ib qho ntawm ob peb lub cev tshwm sim ncaj qha.
Kev siv tooj liab los ntawm tib neeg tau sau tseg thaum ntxov li 8000 bc. Ntau txhiab xyoo tom qab, tooj liab yog thawj tus hlau yuav smelted (kwv yees li 5000 bc); Thawj qhov uas tau raug pov rau hauv pwm (kwv yees li 4000 bc); Thiab thawj tus yuav tsum tau sib xws (txog 3500 BC).
Los ntawm cov hnub nyoog zeb
Ua ntej kev tawm tsam tooj liab, tib neeg tau tsim thiab dhau los ua kev tshaj lij nrog ntau yam ntawm cov cuab yeej pob zeb. Nws yog los ntawm kev ua pob thiab selling ntawm tooj liab los ntawm cov cuab yeej pob zeb uas tus txiv neej siv dag zog pib. Vim tias qhov qis tawv ntawm cov tooj liab ntshiab, tsis muaj qhov kub siab smelting yog qhov yuav tsum tau kom tso cai ntawm tus txiv neej thaum lub tsev liab.
Tom qab rov ua dua pounding, cov cuab yeej pob zeb yuav muaj crumbled, tab sis tus tooj liab tseem nyob hauv siab vim tias nws zoo nkauj ductility. As a result, copper could be used to make fishhooks, needles, scythes, and a variety of other fine and complex tools. Tsis yog tsuas yog cov cuab yeej no sib dua thiab ntau ruaj khov, tab sis lawv kuj tuaj yeem rov ua dua tshiab txawm tias thaum lawv hnav.
Tooj liab tus cwj pwm txawv yog ua rau nws zoo rau kev siv hauv cov khoom zoo nkauj thiab cov kab ke, uas yog cov kab ke kev cai dab qhuas. Kev siv tooj liab tau ua rau noob neej mus leaprog hauv cov khoom lag luam thiab kab lis kev cai, thiab yog li siv hauv lub sijhawm tshiab ntawm kev vam meej.
Bronze muaj hnub nyoog
Bronze tau tsim raws li tib neeg ua tus tooj liab ntau dua. Bronze yog ib qho alloy ntawm tooj liab thiab tin, muaj zog dua thiab muaj zog thiab yog li cov cuab yeej tooj liab dua li cov xim tooj liab, thiab yog li cov cuab yeej ua los ntawm tooj dag zog ntau dua.
Raws li cov khoom siv tau tshaj plaws ntawm lub sijhawm, tooj dag tau siv dav hauv ntau yam tub rog (riam phom thiab cov khoom siv tshuaj tiv thaiv), thiab tau ua rau muaj kev lag luam nrog rau ERA.
Lub Hnub Nyoog Ntawm Hluav Taws Xob
With the spread of electricity, copper once again shone because of its good electrical conductivity, thermal conductivity, ductility, and malleability, and was used in a large number of wires, cables, pipes, radiators, integrated circuits, and a variety of electrical equipment, and the demand for copper is therefore considered to be a barometer of the world's economy.
