Ko e mafana ʻo e efu ʻo e mahoaʻa ko e 400 ° c, tatau mo e pepa combustible.
Efu ukamea, ʻi he tafaʻaki ʻe, lava ke aʻu ki he mafana ʻo e ʻea ʻo hange ko e 2000 ° c, mo e ignition ke hoko ʻa e fakaʻauha ʻi milliseconds. ʻOku tuʻo lahi ange ʻa e lolotonga e efu ʻi he kasa lolotonga, mo e mafana ʻo e ʻea ʻi he vahaʻa ʻo e 2000-3000 ° c mo e teke ʻi he vahaʻa ʻo e 345-690 kPa.
ʻOku fakaʻilongaʻi ʻe he ngaahi fakatata ko ʻeni ʻa e fie maʻu mahuʻinga ki he malu ʻi he ngaahi ʻatakai ʻoku tuʻu laveangofua ki he efu.