It also commonly goes by the name Frank free energy density named after Frederick Charles Frank.
United States Department of Energy | International Atomic Energy Agency | Leadership in Energy and Environmental Design | Orange Free State | Department of Energy | North American Free Trade Agreement | International Confederation of Free Trade Unions | Free University of Berlin | free agent | Free | United States Atomic Energy Commission | Irish Free State | Free State | Free Willy | renewable energy | Free Bird | energy | Detroit Free Press | Congo Free State | Social Distortion | Winnipeg Free Press | International Energy Agency | Free (band) | free trade | Free State (South African province) | free jazz | Altamont Free Concert | Valero Energy Corporation | Radio Free Europe | Free Church of Scotland |