Thermal energy also called heat energy is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other. The energy that comes from the temperature of the heated substance is called thermal energy. Thermal energy is energy that comes from a substance whose molecules and atoms are vibrating faster due to a rise in temperature.
The molecules and atoms that make up matter are moving all the time. When a substance heats up, the rise in temperature makes these particles move faster and bump into each other. Thermal energy is the energy that comes from the heated up substance.
The hotter the substance, the more its particles move, and the higher its thermal energy. The hot chocolate has thermal energy from its vibrating particles. When you pour some cold milk into your hot chocolate, some of this energy is transferred from the chocolate to the particles in the milk.
So what happens? Your hot chocolate cools down because it lost some of its thermal energy to the milk. The tea has thermal energy from its vibrating particles. When you pour some cold milk into your hot tea, some of this energy is transferred from the tea to the particles in the milk. As cold particles heat, they contain more energy and so vibrate and separate. Some matter changes from solid to liquid to gas as its particles heat, vibrate and separate. Boiling a kettle is an example of both thermal and kinetic energy.
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For example, in a steam engine, pistons remove some thermal energy from hot gases. The steam engine then uses these moving pistons to power whatever it is hooked up to, thus converting thermal energy into kinetic energy. These heat engines are always limited by the same laws of chance that keep the water balloon from just jumping up. They can't work if the temperature of all the parts is the same.
They only convert a fraction of the thermal energy to big-scale energy, and that fraction gets small as the temperature differences of the parts gets small. Follow-up on this answer. Related Questions. Still Curious? Kinetic energy can be turned into thermal energy, so why can't thermal energy be be turned into kinetic energy? Hi Grace, Actually, thermal energy is partly a form of kinetic energy; some of it refers to the motion of tiny particles inside a substance.
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