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| the reciprocal of the bulk modulus, equal to the ratio of the fractional change in volume to the stress applied to a body |
| a particle having the same mass and spin as an electron but having a positive charge equal in magnitude to that of the electron's negative charge |
| energy level | |
| —n | |
| 1. | a constant value of energy in the distribution of energies among a number of atomic particles |
| 2. | the energy of a quantum state of a system. The terms energy level and energy state are often used loosely to mean quantum state. This is avoided in precise communication |
| energy level
One of a set of states of a physical system associated with a range of energies. Electrons in an atom, for example, can shift between the different energy levels corresponding to orbitals in different shells. Also called energy state. |
energy level
in physics, any discrete value from a set of values of total energy for a subatomic particle confined by a force to a limited space or for a system of such particles, such as an atom or a nucleus. A particular hydrogen atom, for example, may exist in any of several configurations, each having a different energy. These energy states, in their essentials, remain fixed and are referred to as stationary states.
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