Chophika chozungulira ndi mpweya wotentha womwe ungagwiritsidwe ntchito kuphika kapena kuwotcha zakudya zosiyanasiyana. Pogwiritsa ntchito chophika chozungulira, mankhwalawa amapeza mtundu, kuluma ndi kukoma komwe mukufuna.
Chophika chozungulira chimatha kuthana ndi kuchuluka kosawerengeka kwa kutentha kwa mpweya, chinyezi ndi liwiro.
Zophika zozungulira zimakhala ndi mphamvu zoyambira 500 mpaka 3,000 kg pa ola limodzi.