# Physics quanitity, symbol and value

Jun 17th, 2015
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acceleration due to gravity g 9.806 65 m/s2> age of Universe t0 15(5) Gy> atomic mass unit, unified u 931.494 32(28) MeV/c2 = 1.660 540 2(10) x 10-27 kg> astronomical unit au 1.495 978 706 6(2) x 1011 m Avogadro constant NA 6.022 136 7(36) x 1023 mol-1

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quantitysymbolvalueacceleration due to gravityg9.806 65 m/s2age of Universet015(5) Gyatomic mass unit, unifiedu931.494 32(28) MeV/c2=1.660 540 2(10) x 10-27kgastronomical unitau1.495 978 706 6(2) x 1011mAvogadro constantNA6.022 136 7(36) x 1023mol-1Bohr magnetonmuB5.788 382 63(52) x 10-11MeV/TBohr radiusaoo0.529 177 249(24) x 10-10mBoltzmann constantk1.380 658(12) x 10-23J/K =8.617 385(73) x 10-5eV/Kcosmic background energy densityrhogamma4.647 7 x 10-34(T/2.726 K)4g/cm3=0.260 71 (T/2.726 K)4eV/cm3cosmic background number densityngamma410.89 (T/2.726 K)3cm-3cosmic background temperatureT02.726 +- 0.005 Kcritical density of Universerhoc2.775 366 27 x 1011h02MSMpc-3=1.878 82(24) x 10-29h02g/cm3=1.053 94(13) x 10-5h02GeV/cm3day, mean siderealdsidereal23h56m04s.090 53deuteron (2H) massmd1875.613 39(57) MeV/c2Earth massME5.973 70(76) x 1024kgEarth radius (equatorial)RE6.378 140 x 106melectron charge magnitudee1.602 177 33(49) x 10-19C =4.803 206 8(15) x 10-10esuelectron massme0.510 999 06(15) MeV/c2=9.109 389 7(54) x 10-31kgelectron radius, classicalre2.817 940 92(38) x 10-15melectron Compton wavelengthlambdabare3.861 593 23(35) x 10-13mentropy density/Boltzmann constants/k2.892 4 (T/2.726 K)3cm-3fine structure constantalpha1/137.035 989 5(61)gravitational constantGN6.672 59(85) x 10-11m3/(kg s2) =6.707 11(86) x 10-39h c/(GeV/c2)2

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