The Electromagnetic Spectrum. The electromagnetic (EM) spectrum is the range of all types of EM radiation. Radiation is energy that travels and spreads out as it goes â the visible light that comes from a lamp in your house and the radio waves that come from a radio station are two types of electromagnetic radiation.
Top definition. fathom. 1. a unit of mesuring distance that is 6 feet or about equal to the length of a grown man's outstreched arms. 2. to contemplate or think about with effort. 1.the shipwreck is about 10 fathoms down. 2.who but the almighty can fathom the depths of the abyss.
fathom. n. 1. (Units) a unit of length equal to six feet (1.829 metres), used to measure depths of water. 2. (Mining & Quarrying) mining a unit of volume usually equal to six cubic feet, used in measuring ore bodies.athom-a linear unit of measurement (equal to 6 feet) for water depth. fthm. linear measure, linear unit-a unit of measurement of length. yard, pace-a unit of length equal to 3 feet; defined as 91.44 centimeters; originally taken to be the average length of a stride.