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While a 100% "empty" space is theoretically impossible to find on Earth—and even outer space contains a sparse "interstellar medium" of hydrogen and helium—this ideal state is a critical reference point for science. In classical electromagnetism, free space is the "medium" that allows light and radio waves to travel at their maximum possible speed without interference from obstacles. 2. Free-Space Optical Communication (FSO)

One of the most exciting modern applications is . Unlike traditional internet that travels through fiber-optic glass cables, FSO uses laser beams to transmit data directly through the air or vacuum. Free Space - an overview | ScienceDirect Topics free free space

In the world of physics, "free space" is often used interchangeably with a . It represents a region of the universe completely devoid of matter, particles, and air. While a 100% "empty" space is theoretically impossible