this post was submitted on 02 Mar 2024
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how much do you need to float, if it's helium then 1L lifts about 1g of mass, if it's 50% helium 50% air it lifts 0.5g per liter, then it depends on how heavy balloon is in relation to its volume
The balloon + helium has to be lighter than the (couple of liters of) air it displaces.
He Density (at STP) 0.1786 g/L
The density of air at sea level is about 1.2 g/L
Another interesting factoid about rare elements: Very little nickel is found in the Earth's crust. Most nickel has arrived on Earth from meteors. Usually mixed with iron, which held-back the arrival of the iron-age.