The tourist banana temperature control cup turns boiling water into comfortable warm water at once. What is the principle?

Simply put, it is the principle of physics. The cup liner is wrapped with a layer of phase change material. When boiling water is poured in, the phase change material absorbs the heat of boiling water and starts to heat up. When the temperature of the phase change material reaches the phase change point, it begins to melt. However, in the melting process, its temperature remains unchanged, but it can still absorb heat continuously, so it can continuously absorb the heat of boiling water and cool it down until the heat absorbed by the phase change material is greater than or equal to that absorbed by its sensible heat capacity and latent heat, and the temperature of the phase change material will further increase. However, before the temperature of the phase change material rises further, the temperature of the phase change material has reached an equilibrium state with the temperature of the hot water in the cup, so it can be quickly cooled and kept warm.