equipotential surface

…this example is called an equipotential surface. When equation (5), which defines the potential difference between two points, is combined with Coulomb’s law, it yields the following expression for the potential difference V_A − V_B between points A and B:

…speaking, the geoid is an equipotential surface; that is, it is characterized by the fact that over its entire extent the potential function is constant. This potential function describes the combined effects of the gravitational attraction of Earth’s mass and the centrifugal repulsion caused by the rotation of Earth about…

…ocean surface must be an equipotential surface of the gravitational field, and because the latter reflects variations due to heterogeneities of density within Earth, so also do the equipotentials. The particular equipotential surface that coincides over the oceans with unperturbed mean sea level constitutes the geoid. Under the continents the…