The principle ofThermal expansion of glass bottles, glass is used as an ordinary common materials that are brittle and heat well. When we set the outer surface of the water, it is holders, heat quickly. Makes a difference of expansion both on the outside with the inside of the bottle. And the top with the bottom of the bottle very much. When put into the tank, the temperature changes suddenly so different bottles around the same level of water and the rope that bound them.
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