Micron
A micron is another name for a micrometer, a very small unit of length in the metric system. One micron equals one-millionth of a meter (1 micron = 1 µm = 0.000001 meters). Microns are used to measure extremely small things like bacteria, cells, dust particles, or the thickness of hair and fibers. For example, a human hair is about 70 microns thick. The symbol for micron is "µm". Though “micron” is an older term, it is still commonly used in fields like biology, electronics, and materials science to describe microscopic measurements.
Fathom
A fathom is a unit of length traditionally used to measure the depth of water. It equals 6 feet or approximately 1.8288 meters.
Originating from the Old English word fæðm, meaning "to embrace" or "outstretched arms," the fathom was based on the average distance between a person's outstretched arms. It has been widely used by sailors and navigators to estimate sea depths and underwater distances.
Key facts:
1 fathom = 6 feet
1 fathom ≈ 1.8288 meters
1 fathom = 2 yards
Though modern sonar and electronic instruments now measure depth more precisely, the fathom remains a traditional unit in nautical contexts, especially in maritime charts and historical references.