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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.

Thermal energy - Wikipedia

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 ...

Heat Energy - Definition and Examples - Physics - About.com

physics.about.com/od/glossary/g/heat.htm

Jul 28, 2016 ... This is the definition of heat or thermal energy, particularly as the term applies to physics. Examples of heat energy are provided.

Heat energy | Sciencelearn Hub

sciencelearn.org.nz/Contexts/Fire/Science-Ideas-and-Concepts/Heat-energy

Nov 20, 2009 ... Heat is needed to keep a fire going. It involves the flow of energy between matter in three ways – convection, conduction and radiation.

What is heat or thermal energy? - eSchooltoday

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 ...

heat energy - Dictionary Definition : Vocabulary.com

www.vocabulary.com/dictionary/heat energy

a form of energy that is transferred by a difference in temperature.

What is Thermal Energy? - Definition & Examples - Video & Lesson ...

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...

Heat - BrainPOP

www.brainpop.com/science/energy/heat/

In this educational animated movie about Science learn about temperature, energy, melting, Celsius, Fahrenheit, Kelvin, and thermodynamics.

Heat Energy

www.powermasters.com/heat_energy.html

The heat energy of a substance is determined by how active its atoms and molecules are. A hot object is one whose atoms and molecules are excited and show ...

Examples of Heat Energy

examples.yourdictionary.com/examples-of-heat-energy.html

Heat energy is the term that we use to describe the level of activity for the molecules in an object. An object with molecules that are very excited and zip around ...