energio
Energio is the physical quantity that measures the capacity to perform work or to transfer heat. It exists in multiple forms and can be transformed from one form to another, with the total amount remaining constant in isolated systems. The term is cognate with energy in English; in Esperanto, energio is the noun for energy, reflecting the same root from Greek energeia via Latin energia.
Common forms of energio include kinetic energio (motion), potential energio (position in a field), thermal energio
Units and measurement: the SI unit of energio is the joule (J). Larger quantities use kilojoules or
Conservation and significance: in a closed system energio is conserved, though it may change form. Understanding
History: the concept of energio emerged in the 19th century through the work of scientists such as