Mewaro (CH4) he hau karekau he tae, karekau hoki e mura ana, ka noho hei puna wahie pai ake. Ka mura aunoa i te 538°C, he mura noa ina tae ki nga pāmahana motuhake.
Ka tohuhia e te mura puru, Ka taea e te mewaro te eke ki te teitei o te mahana ki te 1400°C. I te ranu ki te hau, ka riro pahū i waenganui 4.5% a 16% kukū. Kei raro i tenei paepae, ka wera kaha, i runga ake, ka mau i te kaha ake ngingiha.