Aa brass boiler has a base area of 0.15 m2 and thickness 1.0 cm. it boils water at the rate of 6.0 kg/min when placed on a gas stove. estimate the temperature of the part of the flame in contact with the boiler. Thermal conductivity of the brass = 109 J/s/m/k. Heat vapourisation of water = 2256*103 J/kg