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This design makes use the principle of thermal expansion and contraction to check the bath water temperature, while the temperature higher than the set value, the ball will expand and float, lower than the set value, the ball will shrink and sink. The float and sink statues of two balls dynamically indicating the water temperature wether suitable for bathing. (one ball floats and one ball sinks means the water temperature is ok )
Wang Yao, Wu Jianjun, Li Bohan, Liu Dehong