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NEET2026PhysicsChapterActual

Two soap bubbles of unequal radii are connected by a narrow hollow tube. Which of the following correctly describes the flow of air between them?

Options

  1. AAir flows from the smaller bubble to the larger bubble.
  2. BAir flows from the larger bubble to the smaller bubble.
  3. CAir does not flow as the system is already in pressure equilibrium.
  4. DAir flows from the larger to the smaller bubble until their sizes become equal.

Correct answer

A. Air flows from the smaller bubble to the larger bubble.

Step-by-step solution

The excess pressure inside a soap bubble of radius R is given by P = 4T R , where T is the surface tension. Let the radius of the smaller bubble be r and the larger bubble be R , with r The pressure inside the smaller bubble is P₁ = P₀ + 4T r and inside the larger bubble is P₂ = P₀ + 4T R . Since r 4T R , which implies P₁ > P₂ . Air always flows from a region of higher pressure to a region of lower pressure. Therefore, air will flow from the smaller bubble to the larger bubble. Answer: Air flows from the smaller bu

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