https://doi.org/10.1351/goldbook.E02101
In mechanics the sum of , is the sum of where is the the frequency of radiation. In relativistic physics where is the speed of light and the mass.
potential energy
and kinetic energy
. In thermodynamics the thermodynamic energy
or thermodynamic energy
increase, heat
and work
brought to the system. Only changes in energy are measurable. For photons Planck constant
and