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Vor 4 Tagen · In metrology, the Planck constant is used, together with other constants, to define the kilogram, the SI unit of mass. The SI units are defined in such a way that, when the Planck constant is expressed in SI units, it has the exact value = 6.626 070 15 × 10 −34 J⋅Hz −1.
Vor einem Tag · Platinum–iridium bar at melting point of ice (1st CGPM) 1889 0.2–0.1 μm: 10 −7: Platinum–iridium bar at melting point of ice, atmospheric pressure, supported by two rollers (7th CGPM) 1927 n.a. n.a. Hyperfine atomic transition; 1 650 763.73 wavelengths of light from a specified transition in krypton-86 (11th CGPM) 1960 4 nm: 4 × 10 −9
6. Apr. 2024 · List of space groups. There are 230 space groups in three dimensions, given by a number index, and a full name in Hermann–Mauguin notation, and a short name (international short symbol). The long names are given with spaces for readability. The groups each have a point group of the unit cell.
Vor einem Tag · The oldest known metal length standard corresponds to this Sumerian unit and dates from 2650 BCE. This copper bar was discovered in Nippur, on the banks of the Euphrates, and is kept in the Istanbul Archaeological Museum. Archaeologists consider that this 51.85 cm long unit was the origin of the Roman foot.
7. Apr. 2024 · A magnetic field is a physical field that describes the magnetic influence on moving electric charges, electric currents, [1] : ch1 [2] and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field.
Vor 4 Tagen · 20. September 1996. Das Kommando Spezialkräfte ( KSK) ist eine militärische Spezialeinheit und ein Großverband auf Brigadeebene der Bundeswehr für Sondereinsätze, Kommandokriegsführung, Aufklärung, Terrorismusbekämpfung, Rettung, Evakuierung, Bergung sowie Militärberatung. Das KSK untersteht truppendienstlich der Division Schnelle ...
4. Apr. 2024 · spin, in physics, the amount of angular momentum associated with a subatomic particle or nucleus and measured in multiples of a unit called the Dirac h, or h -bar (ℏ), equal to the Planck constant divided by 2π. For electrons, neutrons, and protons, the multiple is 0.5; pions have zero spin.
