<Li> 5 μm--length of a typical human spermatozoon's head </Li> <Li> 3--8 μm--width of strand of spider web silk </Li> <Li> about 10 μm--size of a fog, mist, or cloud water droplet </Li> <P> Between 10 μm and 100 μm </P>

A micron is a measurement of a level of