Pls explain each statement of the answer on why we have used the steps and how their equation is valid - Physics - Mechanical Properties of Fluids

Question

Pls explain each statement of the answer on why we have used the
steps and how their equation is valid but the procedure is clear to
me
on heating water, bubbles being formed at the bottom of the vessel
detach and rise Consider the bubbles to be spheres of radiusRand
making a circular contact of radiusrwith the bottom of the vessel
IfrR, and the surface tension of water isT, value ofrjust before
the bubbles detach is(density of water
isρw)

Jyoti Pant · Accepted Answer

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Buoyancy force on bubble is given by∫Tdl
sinθT×2πr×rR=43πR3ρwg(Using m=volume x
density and F=mg)or r2=23R4ρwgTor r=R223×ρwgT