Quantum Chromodynamics (QCD)
- QCD is the theory that describes the strong interactions between the quarks and gluons within the atomic nucleus. This aptly named strong force is what holds the protons and neutrons (that would otherwise repel) together. The strong force is the stronges of the four fundamental force of nature (which includes gravity, electromagnetic forces, and weak nuclear interaction).
- The strong force behind QCD is also responsible for nuclear fusion (i.e. when two elements combine to form a larger particle). Fusion is regarded by scientists as perhaps the most ideal source of energy, as the process have the potential to produce more energy than any other known sources, but without the radioactive and/or explosive hazards associated with nuclear (fission) energy. Fusion is also how stars (including our Sun) produce their energy. However, the extreme conditions required to generate fusion makes it much more difficult to attain and harness on a large and long-term scale.
