Quantum means "a specific amount (quantity)". Max Planck suggested in 1900 that the energy in a wave of electromagnetic radiation comes in quanta (plural). He found that multiplying a constant by the frequency gives the energy of a single photon of light. See also: Planck, Max, electromagnetic radiation, frequency, photon, Planck's constant, Advanced Topics

This is most simply, a small, discrete unit of energy.

If the magnitude of a quantity is always an integral multiple of a definite unit, then that unit is called the quantum of the electromagnetic field and the meson is considered to be the quantum of the nuclear field.

the specific orbits or velocities to which electrons are limited in the theory of Planck and Bohr.

The amount of energy associated with a photon, equal to hv, where h is the Planck constant, and v is the frequency. The quantum is the smallest amount of energy that can exist at a given frequency.

The minimum energy change of an atom emitting or absorbing energy.

The smallest discrete amount of any substance (plural: quanta).

quantum, how much) An elemental unit of energy. Its energy value is hv, where h, Planck's constant, is 6.62 × 10-27 erg-second and v is the frequency of the vibrations or waves with which the energy is associated. cf photon.

quanta. A discrete packet of energy.

Quantum is the smallest quantity of energy that can be emitted (or absorbed) in the form of electromagnetic radiation. Energy of a quantum () is equal to E = hâˆ™ where is Planck constant and is the frequency of the radiation.

The smallest amount in which energy can exist. The size of a quantum depends on the wavelength of the energy.

any of the small increments or parcels into which many forms of energy are subdivided. quantum theory, quantum physics, quantum mechanics...

The unit quantity of energy according to quantum theory. It is equal to the product of the frequency of the electromagnetic radiation and Planck's constant (6.626 x 10-34 J/s).

An invisible unit of any form of physical energy

a discrete amount of something that is analogous to the quantum in quantum theory

a discreet packet of energy produced by the electron being excited from one atomic orbital to another and then emitting the energy as light as it reenvelops the ground state

a plurality if it is numerable, a magnitude if it is a measurable

a small bundle (particle or unit) of energy like a photon of light

a unit of action, just as a foot is a unit of length or a gram is a unit of weight

a unit of electromagnetic radiation with energy equal to the product of a constant (Planck's constant, ) and the frequency of the radiation, symbolized by the Greek letter nu ()

a unit of execution time that the scheduler is allowed to give to an application before switching to another application

a unit of execution time that the scheduler is allowed to give to an application before switching to other applications

a unit representing the shortest duration note that occurs in any melody

the smallest unit of a discrete property. For instance, the quantum of light is the photon

The indivisible unit in which waves may be emitted or absorbed.

Something which comes in discrete units. Eg, money is quantized (divided into units); it comes in quanta (divisions) of one cent.

A discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents.

Quantum, or quanta, refers to the smallest unit of energy that can be emitted or absorbed by matter. It is a fundamental aspect of the physical universe.

Making use of quantum-mechanical superposition. If you don't know what that means, well, I can't explain it in this sentence. But it has nothing to do with the original meaning of the word 'quantum' (i.e. a discrete unit).

A discrete physical unit into which something can be divided, for example a photon, or the difference in energy states in an atom.

1. For certain physical properties such as energy or momentum, a fundamental unit such that the property appears in integer multiples of the unit. 2. An elementary particle carrying one unit of the property. For example, the photon is the quantum of the electromagnetic field, carrying an energy equal to Planck's contant times the frequency of the light and an angular momentum equal to a multiple of Planck's constant divided by 2.

An entity whose energies occur in discrete lumps--e.g., photons are the quanta of the electromagnetic field. Quanta have both wave and particle aspects, the wave aspect being the probability of detecting the particle at a certain place and time. [Illuminati Papers, 1980

A subrange in quantization.

(plural quanta) Separate units of something. For example, money comes in quanta of 1 cent.

The smallest discrete amount of any quantity (plural: quanta).

One of the very small discrete packets into which many forms of energy are subdivided.

Relating to a philosophy based in energy perception

The smallest 'unit' of energy. A quantum of light is called a photon.

A discrete packet of X-radiation.

The smallest amount of a physical quantity that can exist independently, especially a discrete quantity of electromagnetic radiation.

One of the very small increments or parcels into which many forms of energy are subdivided.

The smallest discrete quantity of some physical property that a system can possess (according to quantum theory).

Smallest (indivisible) unit or 'packet' of energy. The term photon is often used with electromagnetic radiation.

A quantum is a discrete natural unit of charge, energy, angular momentum, or other physical properties.

smallest indivisible unit of radiant energy.

Theory of physics that explains the behaviour of nature and its forces on a very small, subatomic scale. It states that physical quantities can only have discrete values (this is quantization). According to quantum mechanics photons or electrons may be considered as particles but they can also be diffracted like waves (this is referred to as wave-particle duality). This quantum theory was proposed by Max Planck in 1900. Quantum mechanics is the more formal mathematical description of his theory which was developed in the 1920's. It also incorporates the uncertainty principle, which states that you cannot measure a particle's position and velocity at the same time. The more accurately you know its position, the less accurately you know its velocity and vice versa.

In physics, a quantum (plural: quanta) is an indivisible entity of energy. For instance, a photon, being a unit of light, is a "light quantum." In combinations like "quantum mechanics", "quantum optics", etc., it distinguishes a more specialized field of study.