Shenhai Kuputika-Uchapupu
Hupfu dema yakasarudzika inokwanisa kubatidza muvacuum, yakazvimirira kubva kune okisijeni yemuchadenga.
Yakapfuma mu potassium nitrate, kuora kwayo kunosunungura oxygen, iyo inobva yaita zvine simba nemarasha akaiswa mukati nesarufa. Izvi zvakanyanya kuita zvinoburitsa kupisa kukuru, nitrogen gasi, uye carbon dioxide, kuratidza hupfu hunoita exothermic properties.