- #1
physicsforumsfan
- 28
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Hi,
Reading about different ways to lift a human being, I've come to realize the easiest is simply manipulating density as follows:
Denisty of Air at STP: 1.20 kg/m^3
Density of He at STP: 0.000179 kg/m^3
Therefore for every cubic metre (m^3) of air displacement, lift achieved is ~1.2 kg/m^3 (deducting air density from helium density).
Thus to lift 100 kg person, one would need to displace: 100 kg/1.2 kg/m^3 = ~83 m^3 of air
Therefore if a material of negligible weight with dimensions of 4*4*6 metres (equalling 96 m^3) was filled with helium, a net upward lift of approximately 13 kg would be achieved.
Can anyone confirm this to be correct. If yes then what lightweight material could you use to make this?
Thanks everyone in advance
Reading about different ways to lift a human being, I've come to realize the easiest is simply manipulating density as follows:
Denisty of Air at STP: 1.20 kg/m^3
Density of He at STP: 0.000179 kg/m^3
Therefore for every cubic metre (m^3) of air displacement, lift achieved is ~1.2 kg/m^3 (deducting air density from helium density).
Thus to lift 100 kg person, one would need to displace: 100 kg/1.2 kg/m^3 = ~83 m^3 of air
Therefore if a material of negligible weight with dimensions of 4*4*6 metres (equalling 96 m^3) was filled with helium, a net upward lift of approximately 13 kg would be achieved.
Can anyone confirm this to be correct. If yes then what lightweight material could you use to make this?
Thanks everyone in advance