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Specific energy or massic energy is energy per unit mass.It is also sometimes called gravimetric energy density, which is not to be confused with energy density, which is defined as energy per unit volume.
Phase transitions commonly refer to when a substance transforms between one of the four states of matter to another. At the phase transition point for a substance, for instance the boiling point, the two phases involved - liquid and vapor, have identical free energies and therefore are equally likely to exist.
Thermal radiation in visible light can be seen on this hot metalwork, due to blackbody radiation.. The term "thermal energy" is often used ambiguously in physics and engineering. [1]
Physical changes are changes affecting the form of a chemical substance, but not its chemical composition.Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.
Chemical energy is the energy of chemical substances that is released when the substances undergo a chemical reaction and transform into other substances. Some examples of storage media of chemical energy include batteries, [1] food, and gasoline (as well as oxygen gas, which is of high chemical energy due to its relatively weak double bond [2] and indispensable for chemical-energy release in ...