In geometry, a diameter of a circle is any straight line segment that passes
through the center of the circle and whose endpoints lie on the circle. It can
also be defined as the longest chord of the circle. Both definitions are also
valid for the diameter of a sphere.
Diameter is used to describe a physical dimension of an object. In the case
of RVmagnetics, the diameter of a MicroWire sensor (meaning
the length of an imaginable line that would pass through a MicroWire
horizontally) is 3–70 µm, where: