Ko e valitaa ko ha naunau combustible. ʻOku ʻikai crystalline pea ʻoku ʻikai ke ʻi ai ha meʻa pau, fakaʻata ke ʻi ai ha faikehekehe mahino ʻi hono ngaahi foomu fefeka mo huhuʻa.
ʻI he mafana ʻo e ʻea, ʻOku flowable ʻa e valitaa ka ʻoku ʻikai liquify, maʻu hono fakafaʻahinga ko ha “combustible koloa.”