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Isha saliidda cayriin iyo shuruudaha samayntiisa
Batroolka ama cayriin waa nooc ka mid ah walxaha dabiiciga ah ee kakan, ka kooban yahay kaarboon (C) iyo hydrogen (H), kaarboonku guud ahaan waa 80% -88%, hydrogen waa 10% -14%, waxaana ku jira qadar yar ogsijiin (O), baaruud (S), nitrogen (N) iyo xubno kale. Isku-dhafan oo ka kooban walxahan...Sii akhri
