Brownian motion
Videos
Page
Brownian motion is the random motion of particles suspended in a medium.
The equilibrium distribution for particles of gamboge shows the tendency for granules to move to regions of lower concentration when affected by gravity.
Brownian motion on a sphere
Particle
Videos
Page
In the physical sciences, a particle is a small localized object which can be described by several physical or chemical properties, such as volume, density, or mass. They vary greatly in size or quantity, from subatomic particles like the electron, to microscopic particles like atoms and molecules, to macroscopic particles like powders and other granular materials. Particles can also be used to create scientific models of even larger objects depending on their density, such as humans moving in a crowd or celestial bodies in motion.
Arc welders need to protect themselves from welding sparks, which are heated metal particles that fly off the welding surface.
Galaxies are so large that stars can be considered particles relative to them