A fire marshal, in the United States and Canada, is often a member of a fire department but may be part of a building department or a separate department altogether.
An average human red blood cell is approximately 5 microns in diameter. The average diameter of human hair is roughly 0.0035 inches in diameter, which is equivalent to 75 microns. The abbreviation micron was initially used to distinguish the units of a tool used to measure small distances, also called a micrometer.
Improved resin technologies have allowed manufacturers to produce thinner trash can liners that are much stronger than the trash can liners of the past. Micron (a metric measurement. one-millionth part of meter; micrometer). A micron is a measurement based on one hundred thousandths of an inch (.00001).