hii Link haipo kwenye lugha yako, kuangalia kwa: English (en),
au tumia ufasiri wa google:  

cleancooking.org/binary-data/DO...0/000/399-1.pdf

The Water Boiling Test (WBT) is a simplified simulation of the cooking process. It is intended to measure how efficiently a stove uses fuel to heat water in a cooking pot and the quantity of emissions produced while cooking.