"Molelo o simolola fa selo se se thothetsang molelo, se kopane le selekanyo se se siameng sa gase ya oxygen kana sengwe se se na le oxygen, se le gaufi le motswedi wa mogote kana mogote o le kwa godimo ga flash point gore leokwane le ka kopangwa, gape gore e kgona go tshegetsa, selekanyo sa bonako jwa oxidation, e ntshang a tlhakatlhakanyo.  This is commonly called the fire tetrahedron. Fire cannot exist without all of these elements in place and in the right proportions. For example, a flammable liquid will start burning only if the fuel and oxygen are in the right proportions. Some fuel-oxygen mixes may require a catalyst, a substance that is not directly involved in any chemical reaction during combustion, but which enables the reactants to combust more readily."