alleryTwo soap bubbles of radii R₁ < R₂ are connected by a tube. Air flows:
AFrom smaller into the larger
BFrom larger into the smaller
CNeither way — equilibrium
DDepends on temperature
Answer & Solution
Correct answer: A. From smaller into the larger
1. Excess pressure in a soap bubble = 4 T / R.
2. Smaller R ⇒ HIGHER internal pressure.
3. Air flows from HIGH to LOW pressure — i.e., from the smaller bubble into the larger one.
4. The smaller bubble eventually collapses while the larger one grows.
_Source: syllabus Physics Ch 9 §9.8 Bubbles_
Keep practising Mechanical Properties of Solids and Fluids
Browse all Mechanical Properties of Solids and Fluids questions for AP Intermediate 1st Year, or explore more Physics topics.
Related questions
Poiseuille's law gives the volume flow rate Q of a viscous fluid through a horizontal pipeA solid object floats with 80 % of its volume submerged in water (ρ_water = 1000 kg m⁻³). A liquid emerges from a hole at depth h below the free surface of a large open tank. The eThe height to which a liquid rises in a capillary tube of radius r is (with surface tensioThe excess pressure inside a spherical liquid drop of radius R and surface tension T is:Surface tension T of a liquid is best defined as:Reynolds number Re is dimensionless and given by Re = ρ v d / η, where d is a characteristThe terminal velocity v_t of a small sphere of radius r falling in a fluid of viscosity η