The principle of LAVA LAMP is actually very simple. There is an ordinary incandescent light bulb or reflective light bulb at the bottom, and a glass bottle is placed on it. Inside the bottle is a special aqueous solution and waxy solid. When the light bulb is lit, heat is formed, which is transferred from the bottom to the glass bottle. The bottom of the bottle is waxy. After being heated, it melts and gradually becomes lighter, then it will rise slowly, and when it reaches the top when it is slightly cold, it will slowly fall down again, and this is how the floating effect comes about.

LAVA LAMP was put on the market in 1963. At that time, it became a must-have for university student dormitories, scholars' offices, and trendy British living rooms. Because of its slowly changing and endless effects, it will make people daydream and daydream. It seems to have become the POP ICON of people in the 1960s. In the 1970s and 1980s, the sales of LAVA LAMP declined in the upsurge of catching up with high technology.
To make floating bubbles, the two compounds in the lava lamp must be immiscible, i.e. incompatible with each other. This means that liquid A cannot dissolve in liquid B, and the two cannot mix, so you see two separate liquids, one floating on or in the other.