Fluids

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Two soap bubbles of radius R1 and R2 are joined by a straw.Air goes from one bubble to another and a singel bubble of radius R3 is formed.What is surface tension of soap solution if the atmospheric pressure is P0 ?

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Asish Mahapatra ·2009-09-21 20:36:57

Let the surface tension be T (assumption R1>R2 so that air will flow into R1)
Then P_R1 = P_o+4T/R1
n_R1 = (P_o+4T/R₁)*4Î R₁³3RT

similarly n_R2 = (P_o+4T/R₂)*4Î R₂³3RT

Now n_R3 = (P_o+4T/R₃)*4Î R₃³3RT

n_R3=n_R2+n_R1

maybe wrong

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eureka123 ·2009-09-21 20:40:22

looks OK

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