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Cidiyaha Birta
Ciddiyaha maanta sida caadiga ah waxay ka samaysan yihiin bir, inta badan waa la rusheeyaa ama la dahaadhay si looga hortago daxalka xaaladaha adag ama si loo hagaajiyo dhejinta.Cidiyaha caadiga ah ee alwaaxdu badanaa waa bir jilicsan, kaarboon yar ama "qafiif ah" (qiyaastii 0.1% kaarboon, birta inteeda kale iyo laga yaabee raad silikoon ama manganese).Cidiyaha shubka ayaa ka adag, oo leh 0.5-0.75% kaarboon.
