<P> In scientific usage, a phenomenon is any event that is observable, however common it might be, even if it requires the use of instrumentation to observe, record, or compile data concerning it . For example, in physics, a phenomenon may be described by a system of information related to matter, energy, or spacetime, such as Isaac Newton's observations of the moon's orbit and of gravity, or Galileo Galilei's observations of the motion of a pendulum . </P> <P> Another example of scientific phenomena can be found in the experience of phantom limb sensations . This occurrence, the sensation of feeling in amputated limbs, is reported by over 70% of amputees . Although the limb is no longer present, they report still experiencing sensations . This is an extraordinary event that defies typical logic and has been a source of much curiosity within the medical and physiological fields . </P> <P> A mechanical phenomenon is a physical phenomenon associated with the equilibrium or motion of objects . </P> <P> Some examples are Newton's cradle, engines, and double pendulums . </P>

Basic fact that describes the behavior of a natural phenomenon