spherical surface
Refers to the surface of a sphere, often used in geometry and physics.
The Earth's surface is close to a spherical surface.
In mathematics, used to refer to the sphere as a whole, including its surface and interior.
Derive the equation of a sphere.
球体 refers to the whole solid sphere, while 球面 refers only to its curved surface, not the interior volume.
Compound of 球 (kyū, 'sphere') and 面 (men, 'surface').