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.
1 British English: fathom A fathom is a measurement of 1.8 metres or 6 feet, used when referring to the depth of water. 2  NOUNWe sailed into the bay and dropped anchor in five fathoms of water.3  Brazilian Portuguese: braca.  braÃ§aoun. 1  a unit of length equal to six feet (1.829 metres), used to measure depths of water. ( 2 mining) a unit of volume usually equal to six cubic feet, used in measuring ore bodies. ( 3 forestry) a unit of volume equal to six cubic feet, used for measuring timber.