If you are looking for an inexpensive and eco-friendly way to deliver cargo, then have you considered a hot air balloon? Hot air balloons can lift up to 500 kg of mass. If I want the balloon to be able to carry more weight than this, what do I need to change? To find the answer to this question, we have to consider what a kilogram is. A kilogram is 100 grams and one liter of water weighs about one kg, therefore it will take at least 100 liters of water for every additional kg that you want the balloon to lift! -A hot air balloon can lift up to 500kg or mass. If I want more weight than this then I need more volume of gas in order for the balloon not to pop. I may need an expensive pump or compressor if my goal is just lifting very heavy weights (over 500 lbs). You could also use a helium tank but these are only good for lighter loads like balloons because they are less dense than hydrogen tanks which weigh about twice


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