# data[].attributes.body
In physics, the law of Conservation of Energy states that the total energy of an isolated system remains constant — it is said to be conserved over time.

# data[].attributes.body
chemical change. ... a usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance: The formation of rust on iron is a chemical change.

# data[].attributes.body
Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.

# data[].attributes.body
The energy or heat consumed per unit mass during the vaporization of a liquid is called heat of vaporization or enthalpy of vaporization. To condense water vapor to its liquid phase, energy must be removed from the gas. The energy per unit mass required to condense water vapor is equal to the heat of vaporization.

# data[].attributes.body
the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.

# data[].attributes.body
energy that a body possesses by virtue of being in motion.

# data[].attributes.body
the strength and vitality required for sustained physical or mental activity.