Cov kev ceev ntawm cov hlau lead

Lead - ib tug tshwj xeeb hlau uas muaj ib tug ntau ntawm cov zoo thiab tsis zoo zoo, rau ntau xyoo neeg tau kawm kom extract tsis tau tsuas yog teeb meem, tab sis kuj pab tau los ntawm lub physicochemical thaj chaw ntawm lub substance. Tam sim no xws li ib tug lub caij, xws li hmoov txhuas, yog nyob rau hauv lub periodic rooj suav 82, yog raug xa mus rau raws li Pb yog hu ua "Plumbum". Nws yog ib grey, cov kev ceev ntawm cov hlau lead - 11,34g / cm3, yog ib tug ntawm cov softest hlau. Tab sis tsis txhob tsis meej pem ntawm no ob scientific tswv yim. Cov kev ceev ntawm hmoov txhuas nyob rau hauv lwm yam lus - yog nws tej hnyav ib chav tsev ntawm lub ntim, thiab softness ntawm cov qauv yog tshwm sim los ntawm siv lead ua ntxaij ntoo. Lead yog ib tug mos mos xwb nyob hauv cov ntshiab daim ntawv no, tab sis thaum raug los ua cua sov kev kho mob nyob rau hauv kev kub tej yam kev mob, nws yuav ua tau txaus check hlau.

Lub keeb kwm ntawm lub npe "Coj" yog heev contradictory, nyob rau hauv ntau yam lus, nws suab zoo li ib tug "tin" yog tsis xav tsis thoob, vim hais tias cov hmoov txhuas yog zoo li tin, uas qhib ntau tom qab thiab tshuav nws nws tam sim no lub npe, tab sis lub npe ntawm tus tshuaj nyob rau hauv lo lus nug tau hloov. Cov ob co yog heev uas zoo sib xws rau txhua tus lwm yam tsis tau tsuas yog visually, tab sis kuj muaj ib co zog, txawm hais tias cov kev ceev ntawm cov hlau lead yog ntau ntau tshaj cov kev ceev ntawm tin.

Nyob rau hauv cov hlau lead thiab nws cov khoom neeg paub ntau tshaj 7 txhiab. Years BC thiab tej zaum yuav nws yog ib tug huam yuaj, vim hais tias cov hlau muaj ib tug uas tsis muaj melting kub ntawm -327 C. Ib rooj plaub uas vim hais tias ntawm lub hav zoov tua hluav taws, kev huam yuaj, nyob rau hauv cov ntoo tshauv ntoo lead ingots tau pom. Yog li, peb sab nplua nuj tso ntawm no hlau nyob rau hauv America. Lead smelting twb xub paub metallurgical dab uas entail ua ib tug plurality ntawm cov khoom. Piv txwv li, nyob rau hauv ancient Rome, los ntawm cov hmoov txhuas ua cov tais diav, ntxiv rau tshuaj pleev ib ce, nws tau ua txawm dej, aided los ntawm cov kev kub ceev ntawm cov hlau lead thiab muaj peev xwm withstand tsis zoo los ntawm qhov no hlau los ntawm ib ncig chaw. Cov neeg ces tsis paub dab tsi tag nrho cov soluble sib txuas ntawm cov hlau yog heev tshuaj lom.

Tom qab ntawd, ib txhia neeg siv los ua cov txheej txheem ntawm kev tsim txom thiab thaum kawg invented ib yam ntawm cov feem ntau tuag riam phom - ib lub mos txwv. Ntawm chav kawm, nrog kev pab los ntawm cov hlau lead tau thov ib tug ntau ntawm kev puas tsuaj nyob rau hauv lub hnub qub, tab sis tus hlau nws tus kheej vim hais tias dawb huv neeg mus blame. Tam sim no nyob rau hauv peb hnyav uas muaj hnub nyoog, peb tau kawm neeg npaum li cas txiaj ntsim los ntawm cov khoom ntawm cov hlau lead, raws li nws cov txheeb ze ceev plays nyob rau hauv ib txhia qhov chaw ib qho tseem ceeb luag hauj lwm. Kwv yees li ib feem peb ntawm tag nrho cov zus tau tej cov no yam khoom uas yog siv los mus ua kom cov roj teeb rau cov pa tsheb. Tsis tas li ntawd no hlau yog siv nyob rau hauv cov roj kev lag luam, nws yog ntxiv rau cov roj av los txhim kho nws cov qualities. Txij li thaum peb muaj ib xyoo pua ntawm cov tsheb khiav jams thiab lub tsheb yog suab ntawm tag nrho cov, ces siv, thiab ces evaporation ntawm cov hlau lead los ntawm roj av vapor nyob rau hauv cov cua ua enormous kev puas tsuaj rau cov ib puag ncig. Yog hais tias koj tseem coj mus rau hauv tus account lub evaporation ntawm asphalt nyob rau hauv lub kub lub caij, thaum lub bitumen ceev txo nrog ua kub, peb yuav fim ib tug tej kev puas tsuaj. Tab sis tus txiv neej mus blame nws tus kheej!

Cia li xav hais tias, ib xyoo mus rau hauv cov cua los ntawm ntau tshaj 50 txhiab. Tons ntawm cov hlau lead pa. Tseem nws yog siv rau tej hub kev lag luam nyob rau hauv zus tau tej cov siv lead ua, thiab neeg twb tsis hnov txog qhov Dawb Lead? Qhov no cov ntaub ntawv uas yog muaj nyob rau hauv ntau xim, uas, nyob rau hauv particular, yog siv rau cov kev sau ntawv icons. Thaum lub sij hawm, cov neeg tau kawm tsis tau tsuas yog los mus tiv thaiv lawv tus kheej los ntawm cov hlau thiab los tiv thaiv thiab siv nws. Piv txwv li, vim hais tias ntawm ib tug tej yam muaj pes tsawg leeg tau kawm rau painkillers thiab anti-inflammatory siv tshuaj. Thiab ib tug ntawm qhov tseem ceeb thaj chaw ntawm no hlau yog nws "opacity" X-ray thiab tej rays uas yog siv nyob rau hauv X-ray chav thiab cov khoom siv nyob rau hauv lub nuclear kev lag luam.

Nyob rau hauv xaus, peb yuav hais tias muaj tshuaj caij nws muaj nws zoo nta thiab tsis zoo, tab sis uas sawv daws yuav siv, daws tsuas ib tug txiv neej, thiab nws yog zoo yog hais tias nws siv nws txoj kev paub rau qhov zoo ntawm tag nrho cov ntawm peb!