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.
A league is a discontinued unit of linear measurement over water, of about 3 miles. A fathom is approximately 6 feet, Stern is the rear section of a vessel, Bow is the front (pointy end). A knot is 1.15 statute miles per hour, over water. A nautical mile is...1.15 miles, but over water.