Heat, a form of energy, is partly potential energy and partly kinetic energy.

In the context of physical sciences, several forms of energy have been defined. These include: Download high resolution version (1600x1163, 240 KB) Wikipedia does not have an article with this exact name. ... Download high resolution version (1600x1163, 240 KB) Wikipedia does not have an article with this exact name. ... In physics, heat, symbolized by Q, is defined as transfer of thermal energy [1] Generally, heat is a form of energy transfer associated with the different motions of atoms, molecules and other particles that comprise matter when it is hot and when it is cold. ... Potential energy is the energy that is by virtue of the relative positions (configurations) of the objects within a physical system. ... The kinetic energy of an object is the extra energy which it possesses due to its motion. ... Physical science is an encompassing term for the branches of natural science, and science (generally), that study non-living systems, in contrast to the biological sciences. ...

• Thermal energy popularly known as heat
• Chemical energy
• Electrical energy
• Radiant energy commonly known as light energy
• Nuclear energy
• Magnetic energy
• Elastic energy
• Sound Energy
• Hydroelectrical Energy

Some basic textbooks group all these forms of energy into two broad categories:^[1] kinetic energy and potential energy. However, some forms of energy resist such easy classification, as is the case with light energy. Other familiar types of energy (such as heat in most circumstances) are a varying mix of both potential and kinetic energy. 1. ... In physics, heat, symbolized by Q, is defined as transfer of thermal energy [1] Generally, heat is a form of energy transfer associated with the different motions of atoms, molecules and other particles that comprise matter when it is hot and when it is cold. ... It is proposed that this article be deleted. ... Electrical energy can refer to several closely related things. ... Radiant energy is the energy of electromagnetic waves. ... This article or section does not cite any references or sources. ... Nuclear energy is energy released from the atomic nucleus. ... Lightning is the electric breakdown of air by strong electric fields (from electric potential energy to mechanical energy of the random motion of air molecules (heat), and to light). ... The elastic energy is the energy which causes or is released by the Elastic distortion of a solid or a fluid. ... Sound is a disturbance of mechanical energy that propagates through matter as a longitudinal wave, and therefore is a mechanical wave. ... The kinetic energy of an object is the extra energy which it possesses due to its motion. ... Potential energy is the energy that is by virtue of the relative positions (configurations) of the objects within a physical system. ...

However, the above set of the possible forms of energy is not a closed set. Whenever physical scientists discover that certain phenomenon appears to violate the law of energy conservation, new forms can be added, as is the case with dark energy. Conservation of energy states that the total amount of energy in an isolated system remains constant, although it may change forms (for instance, friction turns kinetic energy into thermal energy). ... In physical cosmology, dark energy is a hypothetical form of energy that permeates all of space and tends to increase the rate of expansion of the universe. ...

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