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Thermal energy is generated and measured by heat of any kind. It is caused by the increased activity or velocity of molecules in a substance, which in turn causes temperature to rise accordingly.
There are many natural sources of thermal energy on Earth, making it an important component of alternative energy.

en.wikipedia.org/wiki/Thermal_energy

In thermodynamics, thermal energy refers to the internal energy present in a system due to its temperature. The concept is not well-defined or broadly accepted ...

www.merriam-webster.com/dictionary/thermal%20energy

Define thermal energy: energy in the form of heat. ... free online dictionary, but you are looking for one that's only in the Merriam-Webster Unabridged Dictionary .

study.com/academy/lesson/what-is-thermal-energy-definition-examples.html

This lesson defines and identifies examples of thermal energy everywhere from your kitchen to the Earth's core. We'll discuss geothermal energy, a...

www.yourdictionary.com/thermal-energy

Thermal energy is the energy that is generated and measured by heat. An example of thermal energy is the kinetic energy of an atom. An example of thermal ...

www.khanacademy.org/science/physics/work-and-energy/work-and-energy-tutorial/a/what-is-thermal-energy

This energy is usually in the form of low-level thermal energy. Here, low-level means that the temperature associated with the thermal energy is close to that of  ...

www.chegg.com/homework-help/definitions/thermal-energy-2

Definition of thermal energy and related terms and concepts.

www.softschools.com/facts/energy/thermal_energy_facts/402

Thermal energy is the energy that comes from heat. This heat is generated by the movement of tiny particles within an object. The faster these particles move, the ...

www.eschooltoday.com/energy/kinds-of-energy/what-is-thermal-energy.html

Heat (Thermal energy). Matter is made up of particles or molecules. These molecules move (or vibrate) constantly. A rise in the temperature of matter makes the ...

www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/thermal-energy

Definition of Thermal Energy – Our online dictionary has Thermal Energy information from Macmillan Encyclopedia of Energy dictionary. Encyclopedia. com: ...