According to Laplace's law, if the surface tension of a sphere is doubled, what will happen to the pressure within the sphere?
a. The pressure will decrease by one half.
b. The pressure will increase by one half.
c. The pressure will quadruple.
d. The pressure will double.
ANS: D
Laplace's law, P = 2(ST/r), states that the pressure within a sphere is directly related to the sur-face tension of the liquid and inversely related to the radius of the sphere; that is, both surface tension and pressure within a sphere will change equally in the same proportion.
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