Energy (physics)

''"Energy" redirects here. You might be looking for qi.''

Energy (/ˈɛn-ɜr-ʤi/) is a scalar physical property in physics which is often defined simply as "the ability of a system to perform work." A more comprehensive definition is elusive, because energy occurs in many forms.

The following statements are true of all types of energy:
 * 1) They can be transferred to other objects;
 * 2) They can be converted into all other types of energy;
 * 3) They obey the law of conservation of energy (it cannot be created or destroyed);
 * 4) They can be finitely measured and expressed in terms of mass and density.

Energy and qi
Qi is often inaccurately called "energy." Qi shares many similar attributes with energy but it cannot be finitely measured, nor can it be expressed in terms of mass and density. Physics cannot describe the behaviour of qi, and psionology cannot describe the behaviour of energy.

Energy, hyloeids, and aetherii
Hyloeids are self-contained units which are comprised of matter. However all hyloeids contain energy, either at rest or in motion. Additionally, hyloeids which are living organisms also require available energy to stay alive.

Aetherii are self-contained units which are comprised of energy, and typically exist in regions of low matter density. Additionally, aetherii which are living organisms also require available energy to stay alive.