How to use the thermometer on the electric kettle?

Electric kettle is a common small home appliance, with the continuous development of science and technology, the types of electric kettle is also more and more. That doesn't have the kettle with thermometer below, how, isn't it fine? Do you know the thermometer of how to use electric kettle? The pot than our common pot is more than a bimetallic thermometer, the pot of the bimetallic thermometer on the panels with what we see at ordinary times is different, but the principle is the same. Main use is the principle for the expansion of the solids, its main consists of two kinds of the difference in expansion coefficient of metal, piled up two pieces of metal welded together constitute a bimetal thermal components. When the temperature changes, the two pieces of metal due to varying degrees expansion makes the expansion degree of large pieces of metal bent and, in turn, produce displacement, at this point, the change of temperature has changed to the change of displacement, and according to the conversion relationship between the temperature and the displacement will revert to the measured displacement value can be displayed. The pot with the panel of bimetallic thermometer, there are four points, respectively corresponding to the best temperature is needed to do different things, for example, the first point is boiling the milk, the second point is that the temperature of the coffee & hellip; … Such a small details changed, added convenience to our life, also make life more better quality. How's that？ Will use now? Feel very convenient?