Nalalka caddaynta qarxinta ayaa loo qaybiyaa heerar kala duwan

Iftiinka aan qarxin waxaa loo kala qaybiyay saddex qaybood: IIA, IIB, iyo IIC.

Heerka IIIA

Ku habboon meelaha leh walxaha shidaalka u eg, sida kaalmaha shidaalka. Gaaska wakiilka ee qaybtan waa propane.

Heerka IIB

Loo isticmaalo warshado guud oo ay ku jiraan gaas halis ah. Ethylene waa gaaska wakiilka u ah soociddan.

Heerka IIC

Naqshadeeyay warshado soo shaac baxay hydrogen, acetylene, ama kaarboon disulfide.