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(D) In a gravity-free environment,the shape of the liquid is determined by the minimization of surface energy. The total surface energy is the sum of

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(D) In a gravity-free environment,the shape of the liquid is determined by the minimization of surface energy. The total surface energy is the sum of the liquid-solid surface energy and the liquid-air surface energy. Since the contact angle is zero,the liquid perfectly wets the inner surface of the sphere. To minimize the total surface energy,the liquid will spread to cover the entire inner surface of the sphere,forming a spherical shell of liquid. This configuration maximizes the liquid-solid contact area (which is energetically favorable due to the zero contact angle) and minimizes the liquid-air surface area for a given volume. Therefore,the liquid will coat the inner surface of the sphere.

Consider a spherical body,one third of its volume is filled with a liquid which has a contact angle of zero with the surface of the sphere. If this sphere (along with the liquid) is taken to gravity-free space,then the shape of the liquid inside the sphere will look like:

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