n = number of balloons

0.0001kg = mass of balloon full of helium

0.01 m^3 = volume of balloon

Ok

so do you concur that were I to attach a sufficient number 'n' of helium balloons to myself, I would ascend, yes?

So mass of one balloon is 0.0001/0.01

I mean density

about that

Density of two balloons is 0.0002/0.02

depends on what sort of balloon you're using, what material, rigid or inflatable

Or simplified the same thing

wrong

density of two balloons is 0.0001/0.01 + 0.0001/0.01

What

No.

which is the same as 0.0002/0.01

The mass increases, not the density.

What's 1/2 + 1/2 ?

You have to do the mass and the volume of the ENTIRE system

The total buoyant force increases, though.

and even forgetting the math it's common sense that volume increases

By adding a second balloon, you've doubled both the mass and the volume, so they cancel each other out.

the mass increase so does the volume, however the increase in mass is much much less than the increase in mass would be if you were to fill the balloons with air

that doesn't matter

it could be infinitely less

as long as the ratio stays the same...

Which it obviously does if the helium balloons are identical.

Air has a density of about 1.2kg/m^3, however helium at room temperature at standard air pressure is about 0.164kg/m^3 and hydrogen is lower about 0.1kg/m^3

So for each meter cubed of helium you are adding you can lift about 1kg

Are we changing the subject ok then

So when you have about 100 m^3 of helium you should be able to lift a man

Which law is this?

Archimdedes principle

First law

We are still one that?

F = pVg

p = density

V = volume

g = gravity

Can you really lift a man?

@Ivan Pavlovich What's gravity?