A micron is a micrometer, or one millionth of a meter (1/1,000,000 meters, or 1 x 10 -6 meters). Mesh is a term used for a "screen" or "net" of some kind made of interlacing …fibers or strands of some material. The mesh is a semipermeable "fabric" that will allow materials below a certain size threshold to pass through while stopping others..
Mesh is also a term used in industry to speak to the particle size of irregularly shaped or granular material. For example, if we say "mesh 22" in regards to particle size, that means that particles that are about 1,000 microns in size and smaller will pass the screen, while larger particles will be obstructed and prevented from going through. ( Full Answer )