A spherical shell is a generalization of an annulus to three dimensions. It is the region between two concentric spheres of differing radii.
The spherical shell is implemented in the Wolfram Language as SphericalShell[
x, y, z
, 
b,
a
].
Spherical Shell
See also
Annulus, Ball, Chord, Newton's Shell Theorem, Sphere, Spherical HelixExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Spherical Shell." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/SphericalShell.html