Hi I'm new to Physics Forum but not Physics. I am well versed with the theories of Quantum Mechanics and String Theory. And I have a question, exactly what "type" of energy do strings posses? In other words when we say a string is a "loop" of energy what kind of energy are we referring to; Kinetic, electromagnetic, electric, nuclear or something else? And is there any "generic" state of energy. I mean can we have energy in no specific form just as energy itself or "pure energy"? Thanks for all your help. Legend-of-Nub.