Question

29.
AIIMS 2017
A very long cylindrical shaped soap bubble in air
has radius R. Calculate the excess pressure inside
the bubble. (Surface tension of soap Solution = S]
ON AND FLUID MECHANICS\
25
4S.​

Answer 1

hey dear good morning,

your correct answer is 4s/R

Answer 2

The excess pressure inside the soap bubble is $\dfrac{4S}{R}$

Explanation:

Given that,

Radius = R

We know that,

Excess pressure inside the soap bubble :

Excess pressure is equal to the four times of surface tension divided by radius of soap bubble.

Excess pressure inside the liquid drop :

Excess pressure is equal to the two times of surface tension divided by radius of drop.

We need to calculate the excess pressure inside the soap bubble

Using formula of excess pressure

$P=\dfrac{4S}{R}$

Where, S = surface tension

R = radius of soap bubble

Hence, The excess pressure inside the soap bubble is $\dfrac{4S}{R}$

Learn more :

Topic : surface tension

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