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.
A micron gauge measures the amount of air or ânoncondensablesâ and moisture in a system. The unit of measurement used is a âmicron.â The gauge is placed between the vacuum pump and the middle port of your manifold set. The lower the micron reading, the deeper the vacuum. The deeper the vacuum, the lower the amount of air and moisture in any given system.