question_answer

Two soap bubbles of different diameters are in contact with a certain portion common to both the bubbles. What will be the shape of the common boundary as seen from inside the smaller bubble? Support your answer with a neat diagram. Give reason for your answer.                                          

Answer:

                When seen from inside the smaller bubble, the shape of the common boundary will appear concave, as shown in Fig. Reasons, (i) For a curved liquid film, the pressure is greater on its concave side. (ii) Pressure inside the smaller bubble is more than that inside the larger drop, because \[p\propto 1/r\]