What is the principle of breakfast cup?

The principle of breakfast cup is to divide the cup into two cavities by inner wall and outer wall. When milk needs to be heated, milk can be put in the first cavity or the second cavity, and then hot water can be put in the other cavity. When the utility model is used, hot water and milk can be mixed without waiting for heat exchange, and the hot water and milk are heated through the guide grooves of the inner and outer walls and the grooves of the outer wall guide grooves, and the temperature of the hot water is also reduced. In addition, the protrusions in the groove can make milk and hot water mix quickly and evenly.