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118.8 M: pure osmium at 20 °C (22.587 g/cm 3) [25] 140.5 M: pure copper at 25 °C (8.93 g/cm 3) 10 3: kM: 10 4: 24 kM: helium in the solar core (150 g/cm 3 ⋅ 65%) [26] 10 5: 10 6: MM: 10 7: 10 8: 122.2 MM: nuclei in a white dwarf from a 3 M ☉ progenitor star (10 6.349 g/cm 3) [27] 10 9: GM: 10 10: 10 11: 10 12: TM: 10 13: 10 14: 10 15: PM ...
C nv is C n with the addition of n mirror planes parallel to the axis of rotation. S 2n (for Spiegel , German for mirror ) denotes a group with only a 2n -fold rotation-reflection axis . D n (for dihedral , or two-sided) indicates that the group has an n -fold rotation axis plus n twofold axes perpendicular to that axis.
An example is Bragg's 1921 classical paper on the structure of ice, [11] which gives the c- and a-axis lattice constants as 4.52 A.U. and 7.34 A.U., respectively. Ambiguously, the abbreviation " a.u. " may also refer to the atomic unit of length, the bohr —about 0.53 Å—or the much larger astronomical unit (about 1.5 × 10 11 m ).
For example, the CGS unit of force is the dyne, which is defined as 1 g⋅cm/s 2, so the SI unit of force, the newton (1 kg⋅m/s 2), is equal to 100 000 dynes. On the other hand, in measurements of electromagnetic phenomena (involving units of charge , electric and magnetic fields, voltage , and so on), converting between CGS and SI is less ...
In SI units, the values of c, h, e and k B are exact and the values of ε 0 and G in SI units respectively have relative uncertainties of 1.6 × 10 −10 [16] and 2.2 × 10 −5. [17] Hence, the uncertainties in the SI values of the Planck units derive almost entirely from uncertainty in the SI value of G .
0.223 05 (23) [g] 0.231 21 (4) [h] 0.231 53 (4) [i] 1.0 × 10 −3 1.7 × 10 −4 1.7 × 10 −4 [34] [35] [35] electron g-factor: −2.002 319 304 360 92 (36) 1.8 × 10 −13 [36] muon g-factor −2.002 331 841 23 (82) 4.1 × 10 −10 [37] proton g-factor 5.585 694 6893 (16) 2.9 × 10 −10 [38]
Unit cell definition using parallelepiped with lengths a, b, c and angles between the sides given by α, β, γ [1]. A lattice constant or lattice parameter is one of the physical dimensions and angles that determine the geometry of the unit cells in a crystal lattice, and is proportional to the distance between atoms in the crystal.
Telescoped ammunition for the 40 mm Cased Telescoped Armament System (CTAS) by CTA International (right) 4.73×33mm telescoped and caseless ammunition for the Heckler & Koch G11, with .223 Remington cased ammunition for comparison. Telescoped ammunition is an ammunition design in which the projectile is partially or completely enveloped by the ...