This price is not as good as helium. He said, 1 1,000 yuan is used to transport hydrogen, and a tank of helium can fill 600 balloons. A 40-liter steel cylinder is less than 1, 000 yuan. You just need to pay the deposit for the cylinder and return it when you run out. You can get a small cylinder if you use a small amount, but generally speaking, gas plants only rent 40 liters of cylinders, and sell the small ones directly, for example, 7 liters, 10 liter. Every 400 yuan or so. It is more cost-effective than using this so-called expensive hydrogen as a means of transportation.

And to be honest, helium is safe on such a festive day. Hydrogen balloon explosions often hurt people. Forget it.