There is actually an interlayer in the middle of the 55-degree cup, and the phase change material in the interlayer can absorb heat. This phase change material is a solid with a phase change temperature of 55℃. When people pour boiling hot water into a cup and shake it for at least one minute, the phase change material in the cup quickly absorbs heat and becomes liquid, and the water temperature in the cup drops sharply, thus realizing the cooling function.

Phase change materials can store temperatures. When cold water is poured in, the heat of the phase change material is absorbed and changed back to solid state, and the water temperature will rise, which is actually a very simple physical change.

Therefore, the principle of 55-degree cup is actually an ordinary physical change, just a process of heat transfer, which does no harm to human body.

Extended data:

The 55-degree cup is a high-tech product with rapidly changing warm water. It is the first utility model patent developed, designed and produced by Beijing 55-degree Technology Co., Ltd. Its main function is: pour boiling water at 100 degrees Celsius into the cup, shake it (about 1 minute), and quickly cool it into warm water at about 55 degrees Celsius for human consumption.

References:

Baidu Encyclopedia _55 Degrees Cup People's Health Network _20 16 Don't be fooled by unreliable health rumors.