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Automatic sealing principle of aluminum film balloon
Using the principle of thermal expansion and cold contraction inside the balloon.

When the balloon is filled with gas, the gas molecules collide constantly to generate heat energy, which raises the temperature in the balloon. The surface of aluminum foil has good thermal conductivity, which can quickly transfer heat to the outside and reduce the surface temperature of the balloon. When the gas inside the balloon cools and contracts, the gas pressure drops, and at this time, the balloon mouth automatically contracts and closes, achieving the effect of self-sealing.