Answer
The buoyant force on a soap bubble is not greater than the weight of the bubble. However, because the density of the soap bubble is only slightly higher than the density of the air, the soap bubble will float very gently down to the ground.
Work Step by Step
A bubble is made mostly of air but it has a thin skin of soap around the outside. Because of this thin skin, the average density of the soap bubble is slightly higher than the density of air. Because of a higher density, the weight of the bubble is greater than the buoyant force on the soap bubble.
However, because the density of the soap bubble is only slightly higher than the density of the air, the soap bubble will float very gently down to the ground. While the soap bubble is floating down, it can even get pushed up sometimes on the various air currents that flow naturally in the air, and this can give the appearance that the soap bubble is floating in the air.
