Definition:Impedance of Free Space/Also known as

Impedance of Free Space: Also known as
Impedance of free space is also variously known as:
 * intrinsic impedance of free space
 * wave impedance of free space
 * the vacuum impedance
 * intrinsic impedance of vacuum
 * characteristic impedance of vacuum
 * characteristic impedance of free space
 * wave resistance of free space