Discussion
Consider the following statements:
Assertion (a)
Surface tension acts along the interface of two fluids.
Reason (r)
The pressure of the fluid inside a bubble is higher than that of the fluid outside the bubble.
Which one of the following options is correct?
Answer: B
Both (a) and (r) are true, however (r) is not the correct explanation of (a).
Surface tension is a force per unit length acting tangentially in the interface between two fluids, so the assertion is true.
The reason is also true: across a curved interface surface tension produces a pressure jump, so the pressure inside a bubble exceeds that outside (by \(2\sigma/R\) for a single interface).
But the reason is a consequence of surface tension acting on a curved interface, not an explanation of why surface tension acts along the interface. The assertion is about where the force acts, which follows from the imbalance of molecular attraction at the interface, so (r) does not explain (a).
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