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- Laws of conservation : The laws of science which state that a particular measurable property (or quantity) of an isolated physical system does not change (i.e., is constant) during the course of time.
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- Acceleration : The increase of an objects velocity (or speed) per unit time.
- Angular momentum (classical) : The tendency of a rotating object to resist changes to its rotational motion.
- Born-Oppenheimer approximation : A technique in quantum mechanics in which the kinetic energies of nuclei and electrons are calculated separately.
- Electromagnetic wave : A change, periodic in space and time, of an electric field E(r,t) and a magnetic field B(r,t); a stream of electromagnetic waves, referred to as electromagnetic radiation, can be seen as a stream of massless elementary particles, named photons.
- Energy (science) : A measurable physical quantity of a system which can be expressed in joules (the metric unit for a quantity of energy) or other measurement units such as ergs, calories, watt-hours or Btu.
- Heisenberg Uncertainty Principle : The quantum-mechanical principle that states that certain pairs of physical properties cannot simultaneously be measured to arbitrary precision.
- International System of Units : Metric unit system based on the metre, kilogram, second, ampere, kelvin, mole and candela.
- Mass : The total amount of a substance, or alternatively, the total energy of a substance.
- Noether's theorem : A theorem which states that any differentiable symmetry of the action of a physical system has a corresponding conservation law.
- Photon : elementary particle with zero rest mass and unit spin associated with the electromagnetic field.
- Planck's constant : The constant of proportionality relating the energy of a photon to the frequency of that photon, named sfter Max Karl Ernst Ludwig Planck.
- Quantum mechanics : An important branch of physics dealing with the behavior of matter and energy at very small scales.
- Second : Please do not use this term in your topic list, because there is no single article for it. Please substitute a more precise term. See Second (disambiguation) for a list of available, more precise, topics. Please add a new usage if needed.
- Transport Phenomena : The second edition of a classic chemical engineering book about mass, momentum and energy transport that was first published in 1960.
- Zero-point energy : The lowest possible energy that a quantum mechanical physical system may possess; it is the energy of the ground state of the system.