A saucepan contains water which boils at ϑs = 100.3 ◦C. The base of the saucepan (diameter d = 18 cm) is electrically heated. It reaches a temperature of ϑ W = 108.8 ◦C with a thermal power input of...

A saucepan contains water which boils at ϑs = 100.3 ◦C. The base of the saucepan (diameter d = 18 cm) is electrically heated. It reaches a temperature of ϑ_W
= 108.8 ◦C with a thermal power input of 1.35 kW. How big is the heat transfer coefficient of the boiling water, based on the temperature difference (ϑ_W
− ϑ_s) ?