Thermal energy is a term sometimes used to refer to the internal energy present in a system in a state of thermodynamic equilibrium by virtue of its temperature.

Infrared radiation (IR) is a region of the electromagnetic radiation spectrum where wavelengths range from about 700 nanometers (nm) to 1 millimeter (mm).

A hot dog (also spelled hotdog) is a cooked sausage, traditionally grilled or steamed and served in a sliced bun as a sandwich.

Infrared radiation is the portion of the electromagnetic spectrum that extends from the long wavelength, or red, end of the visible-light range to the microwave range.