which is the us english term for thermal energy
Thermal energy Thermal energy is a term used loosely as a synonym for more rigorously-defined thermodynamic quantities such as the internal energy of a system; heat or sensible heat, which are defined as types of transfer of energy (as is work); or for the characteristic energy of a degree of freedom in a thermal system   k T  {\displaystyle kT} , where   T  {\displaystyle T}  is temperature and   k  {\displaystyle k}  is the Boltzmann constant.