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Pressure inside a drop of liquid is equal to two times the atmospheric pressure. If eight such drops of same liquid coalesce, What will be the excess pressure inside it ? Atmospheric pressure is .
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Correct option is B
If r be the radius of the drop of liquid, Then pressure inside it, p=p0+2Tr∴p0+2Tr=2p0⇒2Tr=p0For the larger drop, 43πR3=8 x 43πr3⇒R=2r∴p'=p0+2T2r=p0+12p0⇒∆p'=p'-p0=p02Similar Questions
Consider the following statements.
(A) Surface tension has same units as force gradient.
(B) Surface tension of a liquid is force per unit length on an imaginary line drawn on the liquid surface.
Select the correct option.
(a) (A) is false, But (B) is true.
(b) Both (A) and (B) are true.
(c) (A) is true, But (B) is false.
(d) Both (A) and (B) are false.
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