Helium

[Haftred]

Suppose I knew the densities of air and helium and I make a helium balloon. If I know the lift (in Newtons), how can I find the volume of the balloon?

[dextercioby]

Suppose I knew the densities of air and helium and I make a helium balloon. If I know the lift (in Newtons), how can I find the volume of the balloon?

Aplly Archimede's law correctly.U should be getting the ratio between the lift and the product between the difference of densities and the gravitational acceleration.

[Haftred]

Do you mean Lift/(g(d2 - d1)) That gives a very large answer.