Hais txog lub tswvyim ntawm iav
iav, kuj hu ua Liuli nyob rau hauv ancient Tuam Tshoj.Cov cim Suav Suav yog sawv cev los ntawm iav.Nws yog ib yam khoom pob tshab uas tsim cov qauv txuas txuas ntxiv thaum yaj.Thaum lub sij hawm txias, lub viscosity maj mam nce thiab hardens yam tsis muaj crystallization.Cov muaj pes tsawg leeg ntawm cov iav tshuaj oxide zoo tib yam yog Na2O•CaO•6SiO2, thiab cov khoom tseem ceeb yog silicon dioxide.
Iav yog tshuaj inert nyob rau hauv ib puag ncig txhua hnub thiab tsis cuam tshuam nrog cov kab mob, yog li nws muaj ntau yam.iav feem ntau insoluble hauv cov kua qaub (tshwj tsis yog: hydrofluoric acid reacts nrog iav los ua SiF4, uas ua rau iav corrosion), tab sis nws yog soluble nyob rau hauv muaj zog alkalis, xws li cesium hydroxide.Cov txheej txheem tsim khoom yog kom yaj ntau yam khoom zoo sib xws thiab ua kom txias sai sai.Txhua lub molecule tsis muaj sijhawm txaus los tsim cov muaju los ua iav.iav yog ib qho khoom ntawm chav tsev kub.Nws yog ib qho khoom tawg yooj yim nrog Mohs hardness ntawm 6.5.
Keeb kwm ntawm iav
Iav yog Ameslikas tau los ntawm kev ua kom cov kua qaub pob zeb ejected los ntawm volcanoes.Ua ntej 3700 BC, cov neeg Iyiv thaum ub muaj peev xwm ua cov iav ornaments thiab iav yooj yim.Lub sijhawm ntawd tsuas muaj xim iav xwb.Ua ntej 1000 BC, Tuam Tshoj tsim cov iav tsis muaj xim.
Nyob rau hauv lub xyoo pua 12th AD, coj mus muag iav rau kev sib pauv tau tshwm sim thiab pib los ua cov khoom lag luam.Nyob rau hauv lub xyoo pua 18th, kom ua tau raws li cov kev xav tau ntawm kev tsim tsom iav, iav optical iav tau tsim.Xyoo 1873, Belgium tau ua tus thawj coj hauv kev tsim cov iav tiaj tus.Nyob rau xyoo 1906, Tebchaws Meskas tau tsim lub tshuab ua iav tiaj tus.Xyoo 1959, lub tuam txhab British Pilkington Glass tau tshaj tawm rau lub ntiaj teb tias cov txheej txheem ntab ntab rau cov iav tiaj tus tau tsim tiav, uas yog kev hloov pauv hauv cov txheej txheem tsim grooved thawj.Txij thaum ntawd los, nrog rau industrialization thiab loj-scale zus tau tej cov iav, iav ntawm ntau yam kev siv thiab ntau yam khoom tau tuaj tawm ib tom qab.Niaj hnub no, iav tau dhau los ua ib yam khoom tseem ceeb hauv lub neej niaj hnub, kev tsim khoom, thiab kev tshawb fawb thiab thev naus laus zis.
Post lub sij hawm: Feb-21-2021