Acts upon any object such

Rotational diffusion is the rotational movement which acts upon any object such as particles, molecules, atoms when present in a fluid, by random changes in their orientations.\nAlthough the directions and intensities of these changes are statistically random, they do not arise randomly and are instead the result of interactions between particles. One example occurs in colloids, where relatively large insoluble particles are suspended in a greater amount of fluid. The changes in orientation occur from collisions between the particle and the many molecules forming the fluid surrounding the particle, which each transfer kinetic energy to the particle, and as such can be considered random due to the varied speeds and amounts of fluid molecules incident on each individual particle at any given time.

The Hawker Hunter had a very long career in Swiss Air Force from the late 1950s until they were retired in 1994. The Swiss Air Force operated 160 aircraft, both new and second-hand. The Hunter was upgraded several times and was used mainly as an attack aircraft by militia squadrons in the last decades of its service life. The retired aircraft had a ready market as a warbird and for use in target facilities operations.