free streaming
Physics and Astronomy
noun
Unimpeded flow; (in fluid dynamics) inertial flow of a fluid unaffected by any obstruction or bounding surface; (in cosmology) the motion of particles which do not collide with each other or interact except gravitationally, and are therefore able to smooth out large-scale density inhomogeneities by moving unimpeded from overdense regions to underdense ones.
adjective
That is undergoing free streaming.
Origin
1940s; earliest use found in Proceedings of the Royal Society of London.