making experiences with... BALOONS

1 space = x F.V/t^2

so add a certain force to baloons that can be calculated because you know the amount of joules in fuels (get the number in joules). That's F.

multiply it for the volume of this baloon (V)

now let's see how long it stays with this volume (t^2 can be reached)

good now you have the variants except x

now control the experiment and get more data and find x

volume would decrease as long as time increases... and force is not the same (it vanishes, goes to environment)

OH MY GOD