Tenne-Sens, Andrej Ottawa, Ontario, Canada.
Last reviewed:June 2018
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- Intuitive notions
- Formal and quantitative concepts
- Units of energy
- Law of conservation of energy
- Energy and special relativity
- Energy in quantum mechanics
- System evolution, entropy, and the second law of thermodynamics
- Types of energy
- Energy as a commodity
- Potential misconceptions
- Energy and cosmology
- Search for the “true” nature of energy
- Links to Primary Literature
- Additional Readings
One of the two fundamental constituents of the universe; it is interconvertible with matter, which is the other constituent. All physical processes involve exchange of energy, or conversion from one of its named forms (including relativistic mass-energy) into another. The total energy (including mass) of a closed system is a conserved quantity (Fig. 1). See also: Matter (physics)
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