One of the mysteries of the English language finally explained.
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.
That is undergoing free streaming.
1940s; earliest use found in Proceedings of the Royal Society of London.
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