How would one go about measuring the volume of a giant soap bubble at any given snapshot of time?

How would one go about measuring the volume of a giant soap bubble at any given snapshot of time?

Assuming you had an infinite budget, what equipment would you need to do this?

3D scanner

Could this measure only the volume of air within the bubble, excluding the volume of the soap bubble film?

> Blow the bubble next to large graph paper.
> calculate volume using (4/3) pi r^3 because the bubble popped by then, so I don't care what the volume is.
> Spend the rest of my less than infinite budget on retirement, since infinity does not exist.

Just a couple of digital cameras (tripped simultaneously) located around it and a little software to do the integration.

Not OP.
I thought of that, but the bubble's non-spherical because of the way the soap is draining.

You can probably look up the thickness of a soap bubble.

This. The bubble will always deviate from a regular spherical shape.

How many cameras do you reckon you'd need to build an accurate model?

3 or 4 should be plenty.
You need 2 at right angles to tell distances.
More refine the shape to account for wind effects. You'll notice your picture isn't perfectly left-right symmetrical.