A surface of equal value, elevation, or potential; particularly used in physics to describe surfaces where a measured property remains constant.
Latin 'equus' (equal) + English 'surface' (from Old French 'surface'). Technical term from physics and geology describing surfaces of uniform characteristics.
Equisurfaces are invisible but everywhere—they're the surfaces of constant gravitational potential around Earth, or constant electric potential around a charged sphere. If you could float freely in space, you'd be on an equisurface the whole time!
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