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How to make a manned airship (helium)
How many liters do you mean by a can?
I remember that the 40L steel cylinder with 10 atmospheric pressure is about 300 cubic meters. The price is 48 yuan/bottle, which is made of oil, natural gas and coal. The price is low, but the purity is not high; If you buy a bottle of electrolyzed water, it's probably 160 yuan, which is expensive but high in purity, 99.999%.
The prices of liquid helium, high-purity helium and pure helium for industrial helium are as follows: liquid helium 150/ liter, high-purity helium 680/ bottle, pure helium 580/ bottle and industrial helium 450/ bottle.
Where to buy: Helium is generally bought by wedding companies or ordered directly at chemical plants; Hydrogen may have to be ordered in specialized chemical plants. Sometimes you buy too little and people don't buy it yet!
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