a unit of mass used in particle physics. Mass and energy are related by Einstein's famous equation, E = mc 2. The constant c is the speed of light, 299.79 x 10 6 m/sec. An energy of 1 electronvolt is therefore equivalent to a mass of about 1.782 662 x 10-33 gram, or about 1.073 544 x 10-9 atomic mass unit.
Yulee is a census-designated place (CDP) in Nassau County, Florida, United States. The population was 11,491 at the 2010 census.
The Yulee area is served by two fire departments. It is served by the all career Nassau County Fire Rescue Stations 30 and 70. Yulee also has its own fire department. The Yulee Volunteer Fire Department is dispatched along with the County department to all fire calls in the Yulee area.