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Vapour Pressure

The excess pr...

Question

The excess pressure inside a soap bubble is (Here, S_la is the surface tension between the liquid-air interface).

A

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B

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C

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D

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Solution

The correct option is A

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Similar questions

The excess pressure inside a liquid drop is (here S_la is the surface tension between the liquid-air interface)

Q. There is a soap bubble in air, having radius

R

and surface tension

T

. The pressure difference across the two surfaces of the soap bubble, given the atmosphere is

P_{0}

Q. A small soap bubble of radius

4 c m

is trapped inside another bubble of radius

6 c m

without any contact. Let

P_{2}

be the pressure inside the inner bubble and

P_{0}

, the pressure outside the outer bubble. Radius of another bubble with pressure difference

P_{2} - P_{0}

between its inside and outside would be

Q. A container filled with air under pressure

P_{0}

contains a soap bubble of radius

R

. The air pressure has been reduced to half isothermally and the new radius of the bubble becomes

\frac{5 R}{4}

. If the surface tension of the soap water solution is

S

P_{0}

\frac{n S}{R}

n

Q. Two soap bubbles of radii

a

b

combine under isothermal conditions to form a single bubble of radius

c

without any leakage of air. If

P_{0} =

atmospheric pressure and

T =

surface tension of soap solution, show that

P_{0} = \frac{4 T (a^{2} + b^{2} - c^{2})}{c^{3} - a^{3} - b^{3}}

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