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... The latest low-temperature of Colorado in Boulder when a team of scientists led by Carl Wieman reported that they had cooled a sample containing 2 × 107 cesium atoms to 1.1 × 10–6 K, about one-millionth of a degree above absolute zero. This record-low temperature was achieved by a technique know as ...
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... 1 unit of charge is 1.602 x 10-19 coulombs. A proton is given a charge of +1 and an electron a charge of -1. All charges are measured in these units. 1 unit of mass is 1.661 x 10-27 kg. This is also not a convenient number, so we use “atomic mass units”. Since the mass of protons and neutrons varies ...
Regents Chemistry
Regents Chemistry

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Expriment5-labReport-Spring2017

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... Answers: At a depth h, the pressure p = hρg, in which ρ is the liquid density and g = 9.8 m s–2. The density of sea water is about 1027 kg/m3. Hence the pressure: p = 1.5x103m (1027 kg/m3) (9.8 m s–2) = 1.5x107 Pa. = 149. 5 atm ( 1.0 atm = 101.3 kPa). In the oceans, the pressure increases by about 1 ...
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che-20028 QC lecture 1 - Rob Jackson`s Website

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Electronic Structure - Chemistry Teaching Resources

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Degenerate matter

Degenerate matter in physics is a collection of free, non-interacting particles with a pressure and other physical characteristics determined by quantum mechanical effects. It is the analogue of an ideal gas in classical mechanics. The degenerate state of matter, in the sense of deviant from an ideal gas, arises at extraordinarily high density (in compact stars) or at extremely low temperatures in laboratories. It occurs for matter particles such as electrons, neutrons, protons, and fermions in general and is referred to as electron-degenerate matter, neutron-degenerate matter, etc. In a mixture of particles, such as ions and electrons in white dwarfs or metals, the electrons may be degenerate, while the ions are not.In a quantum mechanical description, free particles limited to a finite volume may take only a discrete set of energies, called quantum states. The Pauli exclusion principle prevents identical fermions from occupying the same quantum state. At lowest total energy (when the thermal energy of the particles is negligible), all the lowest energy quantum states are filled. This state is referred to as full degeneracy. The pressure (called degeneracy pressure or Fermi pressure) remains nonzero even near absolute zero temperature. Adding particles or reducing the volume forces the particles into higher-energy quantum states. This requires a compression force, and is made manifest as a resisting pressure. The key feature is that this degeneracy pressure does not depend on the temperature and only on the density of the fermions. It keeps dense stars in equilibrium independent of the thermal structure of the star.Degenerate matter is also called a Fermi gas or a degenerate gas. A degenerate state with velocities of the fermions close to the speed of light (particle energy larger than its rest mass energy) is called relativistic degenerate matter.Degenerate matter was first described for a mixture of ions and electrons in 1926 by Ralph H. Fowler, showing that at densities observed in white dwarfs the electrons (obeying Fermi–Dirac statistics, the term degenerate was not yet in use) have a pressure much higher than the partial pressure of the ions.
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