Babu yowaza magalasi ndi chipangizo chodalirika komanso chodalirika chomwe chimagwiritsidwa ntchito poyatsira mutu wamoto. Babu yoyaka ndi yosavuta kugwiritsa ntchito, yokhala ndi babu yaing'ono ya thermo yopangidwa ndi galasi yokhala ndi madzi amadzimadzi omwe amakula mwachangu akakumana ndi kutentha kokwera, kuphulitsa babu yagalasi pa kutentha komwe adadziwiratu, ndikuyambitsa chowaza.