This is just what one might naively expect, but we expected that an upward drag would occur.
2.
For all but the most violent bubbles, this upward drag might be enough to keep an object afloat.
3.
The role of apparent weight is also important in fluidization, when dealing with a number of particles, as it is the amount of force that the " upward drag force " needs to overcome in order for the particles to rise and for fluidization to occur.
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