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    Question

    Small bubbles are perfectly spherical because of

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    A Gravity Correct Answer Incorrect Answer
    B Pressure Correct Answer Incorrect Answer
    C Viscosity Correct Answer Incorrect Answer
    D Surface tension Correct Answer Incorrect Answer

    Solution

    Surface tension is responsible for the shape of liquid droplets. Although easily deformed, droplets of water tend to be pulled into a spherical shape by the cohesive forces of the surface layer. In the absence of other forces, including gravity, drops of virtually an liquids would be perfectly spherical. The spherical shape minimizes the necessary "wall tension" of the surface layer according to Laplace's law.

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