28.12.2013 Views

preface to fifteenth edition

preface to fifteenth edition

preface to fifteenth edition

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

GENERAL INFORMATION, CONVERSION TABLES, AND MATHEMATICS 2.5<br />

TABLE 2.1<br />

Fundamental Physical Constants (Continued)<br />

C. Recommended consistent values of constants (continued)<br />

Quantity Symbol Value*<br />

1 u 931.501 6(26) MeV<br />

Faraday constant F 96 485.309(29) C · mol 1<br />

Fine structure constant 0.007 297 353 08(33)<br />

1 137.035 989 5(61)<br />

First radiation constant c 1 3.741 774 9(22) 10 16 W·m 2<br />

Gas constant R 8.314 510(70) J · K 1 ·mol 1<br />

g fac<strong>to</strong>r (Lande) for free electron g e 2.002 319 304 386(20)<br />

Gravitational constant G 6.672 59(85) 10 11 m 3 ·kg 1 ·s 2<br />

Hartree energy E h 4.359 748 2(26) 10 18 J<br />

Josephson frequency-voltage ratio<br />

4.835 939(13) 10 14 Hz · V 1<br />

Magnetic flux quantum 0 2.067 851(5) 10 15 Wb<br />

Magnetic moment of pro<strong>to</strong>ns in water p / B 1.520 993 129(17) 10 3<br />

Molar volume, ideal gas, p 1 bar,<br />

22.711 08(19) L · mol 1<br />

0C<br />

Neutron rest mass m n 1.674 928 6(10) 10 27 kg<br />

Nuclear magne<strong>to</strong>n N 5.050 786 6(17) 10 27 J·T 1<br />

Permeability of vacuum 0 4 10 7 H·m 1 exactly<br />

Permittivity of vacuum 0 8.854 187 816 10 12 F·m 1<br />

h/2 1.054 572 66(63) 10 34 J·s<br />

Planck constant h 6.626 0.75 5(40) 10 34 J·s<br />

Pro<strong>to</strong>n magnetic moment p 1.410 607 61(47) 10 26 J·T 1<br />

Pro<strong>to</strong>n magne<strong>to</strong>gyric ratio p 2.675 221 28(81) 10 8 s 1 ·T 1<br />

Pro<strong>to</strong>n resonance frequency per field in H 2 O /2 p<br />

42.576 375(13) MHz · T 1<br />

Pro<strong>to</strong>n rest mass m p 1.672 623 1(10) 10 27 kg<br />

Quantum-charge ratio h/e 4.135 701(11) 10 15<br />

J·Hz 1 ·C 1<br />

Quantum of circulation h/m e 7.273 89(1) 10 4 J·s·kg 1<br />

Ratio, electron-<strong>to</strong>-pro<strong>to</strong>n magnetic moments e / p 6.582 106 88(7) 10 2<br />

Rydberg constant R 1.097 373 153 4(13) 10 7 m 1<br />

Second radiation constant c 2 1.438 769(12) 10 2 m·K<br />

Speed of light in vacuum c 0 299 792 458 m · s 1 exactly<br />

Standard acceleration of free fall g n 9.806 65 m · s 2 exactly<br />

Standard atmosphere atm 101 325 Pa exactly<br />

Stefan-Boltzmann constant 5.670 51(19) 10 8 W·m 2 ·K 4<br />

Thomson cross section e 6.652 448(33) 10 29 m 2<br />

Wien displacement constant b 0.289 78(4) cm · K<br />

Zeeman splitting constant B /hc 4.668 58(4) 10 5 cm 1 ·G 1<br />

D. Units in use <strong>to</strong>gether with SI units<br />

Physical quantity Name of unit Symbol for unit Value in SI units<br />

Area barn b 10 28 m<br />

Energy electronvolt eV (e V) 1.60218 10 19 J<br />

megaelectronvolt 1<br />

MeV<br />

Length ångström 2 Å 10 10 m; 0.1 nm<br />

Mass <strong>to</strong>nne t 10 3 kg; Mg<br />

*The digits in parentheses following a numerical value represent the standard deviation of that value in terms of the final<br />

listed digits.<br />

1<br />

The term million electronvolts is frequently used in place of megaelectronvolts.<br />

2<br />

The ångström and bar are approved for temporary use with SI units; however, they should not be introduced if not used at<br />

present.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!