More precisely, the geoid is the surface of gravitational equipotential at mean sea level. This equipotential surface, or surface of constant geopotential, is called the geoid.. The geoid is a particular equipotential surface, and is somewhat involved to compute. For two-dimensional potential flow, streamlines are perpendicular to equipotential lines. In electrostatics a conductor is a three-dimensional equipotential region. Then it can be shown that the equipotential solution is an ellipsoid of revolution. The equipotential lines for this function are concentric circles. The displayed surface is the equipotential surface (implicit surface) formula 44. The collector is shaped to provide a smooth equipotential surface underneath the corona wire. The term equipotential line or isopotential line refers to a curve of constant electric potential. TPMS have been observed as biological membranes, as block copolymers, equipotential surfaces in crystals etc. Moreover, the surface of the satellite is an equipotential one. The surface then experiences a down slope, in the direction that the equipotential has risen. This attachment creates an equipotential balance between all items and personnel. Equipotential bonding involves electrically connecting metalwork so that it is at the same voltage everywhere.