Definition of Knot
The term knot represents a speed unit primarily utilized in the domains of aviation and maritime. It corresponds to one nautical mile per hour. The nautical "knot", distinct from a tied rope, serves as a speed metric. A single knot roughly equates to 1.151 standard (statute) miles per hour or 1.852 kilometers per hour.

Origins of the Knot
The origin of "knot" traces back to the historical method of employing a "log-line" to assess a ship's velocity. This line was a cord marked by equidistant knots and was unspooled from the ship's stern over a predetermined span of time. The count of knots that went overboard would ascertain the ship's speed, leading to the endorsement of the term "knot".

Usage of Knots in Different Fields
Maritime: In maritime settings, the knot finds global application to express the speed of a vessel. It forms an indispensable measure for navigation because nautical charts adhere to the scale of nautical miles.

Aviation: In aviation, the knot serves to denote airspeed and wind speed. It functions as a universal unit for pilots, air traffic controllers, and meteorologists, promoting unambiguous communication regarding speed across various nationalities and languages.

Meteorology: Knots find use in meteorology to convey information related to the speed of wind currents, storm systems, and additional atmospheric phenomena.

Conversion of Knots to Other Units
The conversion of knots to other units is uncomplicated. As highlighted earlier, 1 knot corresponds to 1.151 miles per hour or 1.852 kilometers per hour. To convert knots to miles per hour, the knot figure needs to be multiplied by 1.151. To express knots in kilometers per hour, multiplication by 1.852 is required. To revert these units to knots, the result should be divided by the appropriate factor.