Internal Energy Biology Definition. It may be thermal in the form of heat electrical mechanical chemical radiant or kinetic. It is the sum of the kinetic and potential energies of its constituent atoms molecules etc.
It is closely related to the temperature of the system. In thermodynamics the internal energy is the total energy contained by a thermodynamic system. Like any other state function the value of the energy depends upon the state of the substance and not upon the nature of the processes by which it attained that state.
Definition of internal energy.
This is the actual definition of internal energy as per Wikipedia. Chemistry the thermodynamic property of a system that changes by an amount equal to the work done on the system when it suffers an adiabatic change. It is the energy needed to create the system but excludes the energy to displace the systems surroundings any energy associated with a move as a whole or due to external force fields. One formulation of this law based on experience.