Question

consider me a balloon of mass 0.03kg being inflated with a gas of density 0.54kgm^-3. what will be the volume f the balloon when it just begins to rise in air of density 1.29kgm^-3

Answer 1

$$mg=(\rho -\rho_g)g V\\0.03=(1.29 -0.54) V\\V=0.04\ m^3$$