Home › CBSE Class 11 (Science) › Physics › Mechanical Properties of Fluids › Why does a soap bubble have a larger excess pres…
Why does a soap bubble have a larger excess pressure than a drop of equal size?
AIt has more mass
BIt contains air
CIt has two surfaces
DIt is always larger
Answer & Solution
Correct answer: C. It has two surfaces
The film has an inner and an outer surface, doubling the surface tension effect to 4S/r.
Related questions
What happens to oil droplets in pure water without any surfactant?What effect does adding a surfactant have on soap bubbles in water?What is the direction of Stokes drag on a slow sphere in a fluid?Which laboratory device is based on Stokes's law for a sphere sinking in a stationary liquA sphere falls at terminal speed in a viscous fluid. Doubling its radius changes that speeA narrow tube lifts a liquid against gravity because of surface tension. What is this effeIn SI units, surface tension is expressed in which unit?By roughly what factor can added surfactants lower the surface tension of water?