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How many liters of hydrogen do 520 heart-shaped balloons need? Where can I sell hydrogen in Chengdu? It is urgent.
520 1, 10 inch heart-shaped balloon needs at least 1 to fill 40 liters of hydrogen.

You can't buy hydrogen directly in Chengdu, because hydrogen is very dangerous. Unless you are qualified to charge hydrogen.

My advice to you is to contact the balloon company to help you inflate, so that you will be very worry-free and convenient.

There are many balloon companies in Chengdu, such as Red Star Balloon, 79C Balloon and vzvz Balloon. Find it yourself. There are many.

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