What is the hotter the weather, the higher it climbs. What is a two-color ball puzzle?

The hotter the mercury thermometer is, the higher it climbs.

Mercury thermometer is an expansion thermometer. The freezing point of mercury is -38.87℃ and the boiling point is 356.7℃. Used to measure the temperature in the range of 0- 150℃ or 500℃. Can only be used as a tool for local supervision. Using it to measure temperature is not only simple and intuitive, but also can avoid the error of external remote thermometer.

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