Conversion Factors, Material Properties and Physical Constants

As provided in engineering classes at MIT, compiled for easy reference.
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Conversion Factors (convert one unit to another)
Material constants (thermal, mechanical, electrical, etc. properties)
Physical constants (properties of the universe)
Astronomical constants (properties of THE UNIVERSE)
NIST precise values (the standard values of important constants)

Conversion Factors

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This table gives conversion factors to convert various units to their SI equivalents. It will not be very useful for people who prefer to use cgs or English units although it can be used to convert from SI to those systems.

Name	To convert from	to	multiply by	divide by
Acceleration	ft/sec^2	m/s^2	0.3048	3.2810
Area	acre	m^2	4047	2.471E-04
Area	ft^2	m^2	9.294E-02	10.7600
Area	hectare	m^2	1.000E+04	1.000E-04
Area	in^2	m^2	6.452E-04	1550
Density	g/cm^3	kg/m^3	1000	1.000E-03
Density	lbm/ft^3	kg/m^3	16.02	6.243E-02
Density	lbm/in^3	kg/m^3	2.767E+04	3.614E-05
Density	lb s^2/in^4	kg/m^3	1.069E+07	9.357E-08
Density	slug/ft^3	kg/m^3	515.40	1.940E-03
Energy	BTU	J	1055	9.478E-04
Energy	cal	J	4.1859	0.2389
Energy	erg	J	1.000E-07	1.000E+07
Energy	ev	J	1.602E-19	6.242E+18
Energy	ft lbf	J	1.3557	0.7376
Energy	kiloton TNT	J	4.187E+12	2.388E-13
Energy	kW hr	J	3.600E+06	2.778E-07
Energy	megaton TNT	J	4.187E+15	2.388E-16
Force	dyne	N	1.000E-05	1.000E+05
Force	lbf	N	4.4484	0.2248
Force	ozf	N	0.2780	3.5968
Heat capacity	BTU/lbm F	J/kg C	4188	2.388E-04
Heat transfer coefficient	BTU/hr ft^2 F	W/m^2 C	5.6786	0.1761
Length	AU	m	1.496E+11	6.685E-12
Length	ft	m	0.3048	3.2810
Length	in	m	2.540E-02	39.3700
Length	mile	m	1609	6.214E-04
Length	Nautical mile	m	1853	5.397E-04
Length	parsec	m	3.085E+16	3.241E-17
Mass	amu	kg	1.661E-27	6.022E+26
Mass	lbm	kg	0.4535	2.2050
Mass	lb s^2/in	kg	1200.00	5.711E-03
Mass	slug	kg	14.59	6.853E-02
Mass flow rate	lbm/hr	kg/s	1.260E-04	7937
Mass flow rate	lbm/sec	kg/s	0.4535	2.2050
Moment of inertia	ft lb s^2	kg m^2	1.3557	0.7376
Moment of inertia	in lb s^2	kg m^2	0.1130	8.8510
Moment of inertia	oz in s^2	kg m^2	7.062E-03	141.60
Power	BTU/hr	W	0.2931	3.4120
Power	hp	W	745.71	1.341E-03
Power	tons of refrigeration	W	3516	2.844E-04
Pressure	bar	Pa	1.000E+05	1.000E-05
Pressure	dyne/cm^2	Pa	0.1000	10.0000
Pressure	in. mercury	Pa	3377	2.961E-04
Pressure	in. water	Pa	248.82	4.019E-03
Pressure	kgf/cm^2	Pa	9.807E+04	1.020E-05
Pressure	lbf/ft^2	Pa	47.89	2.088E-02
Pressure	lbf/in^2	Pa	6897	1.450E-04
Pressure	mbar	Pa	100.00	1.000E-02
Pressure	microns mercury	Pa	1.3332	0.7501
Pressure	mm mercury	Pa	1333	7.501E-04
Pressure	std atm	Pa	1.013E+05	9.869E-06
Specific heat	BTU/lbm F	J/kg C	4186	2.389E-04
Specific heat	cal/g C	J/kg C	4186	2.389E-04
Temperature	F	C	0.5556	1.8000
Thermal conductivity	BTU/hr ft F	W/m C	1.7307	0.5778
Thermal conductivity	BTU in/hr ft^2 F	W/m C	0.1442	6.9340
Thermal conductivity	cal/cm s C	W/m C	418.60	2.389E-03
Thermal conductivity	cal/ft hr F	W/m C	6.867E-03	145.62
Time	day	s	8.640E+04	1.157E-05
Time	sidereal year	s	3.156E+07	3.169E-08
Torque	ft lbf	N m	1.3557	0.7376
Torque	in lbf	N m	0.1130	8.8504
Torque	in ozf	N m	7.062E-03	141.61
Velocity	ft/min	m/s	5.079E-03	196.90
Velocity	ft/s	m/s	0.3048	3.2810
Velocity	km/hr	m/s	0.2778	3.6000
Velocity	miles/hr	m/s	0.4470	2.2370
Viscosity - absolute	centipose	N s/m^2	1.000E-03	1000
Viscosity - absolute	g/cm s	N s/m^2	0.1000	10
Viscosity - absolute	lbf/ft^2 s	N s/m^2	47.87	2.089E-02
Viscosity - absolute	lbm/ft s	N s/m^2	1.4881	0.6720
Viscosity - kinematic	centistoke	m^2/s	1.000E-06	1.000E+06
Viscosity - kinematic	ft^2/sec	m^2/s	9.294E-02	10.7600
Volume	ft^3	m^3	2.831E-02	35.3200
Volume	in^3	m^3	1.639E-05	6.102E+04
Volume	liters	m^3	1.000E-03	1000
Volume	U.S. gallons	m^3	3.785E-03	264.20
Volume flow rate	ft^3/min	m^3/s	4.719E-04	2119
Volume flow rate	U.S. gallons/min	m^3/s	6.309E-05	1.585E+04

Material constants

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This table gives various material properties listed alphabetically. The units are SI.

Conductivity Acetyl 0.2300 W/m C

Conductivity Acrylic 0.1400 W/m C

Conductivity Aluminum 2024-T3 190.40 W/m C

Conductivity Aluminum 3003 0.4000 W/m C

Conductivity Aluminum 6061-T6 155.80 W/m C

Conductivity Aluminum 7079-T6 121.10 W/m C

Conductivity Beryllium QMV 147.10 W/m C

Conductivity Borosilicate glass 1.1300 W/m C

Conductivity Borosilicate glass (Tempax) 1.1300 W/m C

Conductivity Concrete (sand & gravel) 1.8000 W/m C

Conductivity Copper - pure 392.90 W/m C

Conductivity Diamond 550.00 W/m C

Conductivity Douglas fir 0.1100 W/m C

Conductivity Dow Corning 200 (350cSt) 0.1590 W/m C

Conductivity Dow Corning 739 0.1900 W/m C

Conductivity Dow Corning 93-500 0.1500 W/m C

Conductivity Dow Corning Q3-6605 0.8400 W/m C

Conductivity Epoxy (Epotek 353ND) 0.0490 W/m C

Conductivity Epoxy (Masterbond 11A0) 1.4400 W/m C

Conductivity Glass wool 0.0400 W/m C

Conductivity Gold - pure 297.70 W/m C

Conductivity Helium 2.7700 W/m C

Conductivity Ice 2.2000 W/m C

Conductivity Iron 83.50 W/m C

Conductivity Lead - pure 37.04 W/m C

Conductivity Limestone 0.5000 W/m C

Conductivity Magnesium HK31A-H24 114.20 W/m C

Conductivity Magnesium AZ31B-H24 95.19 W/m C

Conductivity Methane 0.3030 W/m C

Conductivity Molybdenum - wrought 143.60 W/m C

Conductivity Nickel - pure 91.73 W/m C

Conductivity Nitrogen 0.1460 W/m C

Conductivity Nylon 0.2400 W/m C

Conductivity Platinum 69.23 W/m C

Conductivity Polycarbonate 0.2000 W/m C

Conductivity Polypropylene 0.4000 W/m C

Conductivity Polystyrene foam 0.3600 W/m C

Conductivity Polyurethane foam 0.0260 W/m C

Conductivity PTFE 0.2400 W/m C

Conductivity Quartz 1.3200 W/m C

Conductivity SiC Alpha 77.50 W/m C

Conductivity SiC sintered KT 80.00 W/m C

Conductivity Silastic E 0.1800 W/m C

Conductivity Silastic L 0.2800 W/m C

Conductivity Silicone foam (Poron) 0.0600 W/m C

Conductivity Silver - pure 417.10 W/m C

Conductivity Snow (light) 0.6000 W/m C

Conductivity Snow (packed) 2.2000 W/m C

Conductivity Soil (coarse) 0.5200 W/m C

Conductivity Soil (dry w/stones) 0.5200 W/m C

Conductivity Soil (dry) 0.2300 W/m C

Conductivity Soil (w/42% water) 1.1000 W/m C

Conductivity Steel AISI 304 16.27 W/m C

Conductivity Steel AISI C1020 46.73 W/m C

Conductivity Tantalum 53.65 W/m C

Conductivity Titanium B 120VCA 7.4420 W/m C

Conductivity Tungsten 164.40 W/m C

Conductivity Water 0.6030 W/m C

Conductivity White pine 0.1100 W/m C

Density Acrylic 1400 kg/m^3

Density Air (2800 m) 0.9800 kg/m^3

Density Air (STP) 1.2930 kg/m^3

Density Aluminum 2024-T3 2770 kg/m^3

Density Aluminum 3003 2700 kg/m^3

Density Aluminum 6061-T6 2700 kg/m^3

Density Aluminum 7079-T6 2740 kg/m^3

Density Ammonia - liquid 682.10 kg/m^3

Density Argon - liquid 1390 kg/m^3

Density Beryllium QMV 1850 kg/m^3

Density Borosilicate Ohara E6 2180 kg/m^3

Density Borosilicate Tempax 2230 kg/m^3

Density Concrete 2242 kg/m^3

Density Copper - pure 8900 kg/m^3

Density Dow Corning 200 (350cSt) 968.00 kg/m^3

Density Fused silica 2200 kg/m^3

Density Glass wool 64.00 kg/m^3

Density Gold - pure 1.932E+04 kg/m^3

Density Helium - liquid 125.00 kg/m^3

Density Hydrogen - liquid 70.00 kg/m^3

Density Iron 7830 kg/m^3

Density Lead - pure 1.134E+04 kg/m^3

Density Magnesium AZ31B-H24 1770 kg/m^3

Density Magnesium HK31A-H24 1790 kg/m^3

Density Methane - liquid 424.00 kg/m^3

Density Molybdenum - wrought 1.030E+04 kg/m^3

Density Neon - liquid 1200 kg/m^3

Density Nickel - pure 8900 kg/m^3

Density Nitrogen - liquid 804.00 kg/m^3

Density Nylon 1700 kg/m^3

Density Platinum 2.145E+04 kg/m^3

Density Polycarbonate 1300 kg/m^3

Density Polyethylene 2300 kg/m^3

Density PTFE 1200 kg/m^3

Density SiC Alpha 2975 kg/m^3

Density SiC sintered KT 2975 kg/m^3

Density Silver - pure 1.050E+04 kg/m^3

Density Steel AISI 304 8030 kg/m^3

Density Steel AISI C1020 7850 kg/m^3

Density Tantalum 1.660E+04 kg/m^3

Density Titanium B 120VCA 4850 kg/m^3

Density Tungsten 1.930E+04 kg/m^3

Density Water (4 C) 999.97 kg/m^3

Density White pine 513.00 kg/m^3

Elastic modulus Aluminum 2024-T3 7.310E+10 Pa

Elastic modulus Aluminum 6061-T6 7.310E+10 Pa

Elastic modulus Aluminum 7079-T6 7.172E+10 Pa

Elastic modulus Beryllium QMV 2.897E+11 Pa

Elastic modulus Borosilicate Ohara E6 5.743E+10 Pa

Elastic modulus Borosilicate Tempax 6.200E+10 Pa

Elastic modulus Copper - pure 1.172E+11 Pa

Elastic modulus Gold - pure 7.448E+10 Pa

Elastic modulus Lead - pure 1.379E+10 Pa

Elastic modulus Magnesium AZ31B-H24 4.483E+10 Pa

Elastic modulus Magnesium HK31A-H24 4.414E+10 Pa

Elastic modulus Molybdenum - wrought 2.759E+11 Pa

Elastic modulus Nickel - pure 2.207E+11 Pa

Elastic modulus Platinum 1.469E+11 Pa

Elastic modulus SiC Alpha 4.760E+11 Pa

Elastic modulus SiC sintered KT 3.320E+11 Pa

Elastic modulus Silver - pure 7.241E+10 Pa

Elastic modulus Steel AISI 304 1.931E+11 Pa

Elastic modulus Steel AISI C1020 2.034E+11 Pa

Elastic modulus Tantalum 1.862E+11 Pa

Elastic modulus Titanium B 120VCA 1.021E+11 Pa

Elastic modulus Tungsten 3.448E+11 Pa

Electrical resistivity Aluminum 2017 4.000E-08 ohm m

Electrical resistivity Aluminum 3003 4.000E-08 ohm m

Electrical resistivity Aluminum 99.996% 2.655E-08 ohm m

Electrical resistivity Copper 1.673E-08 ohm m

Electrical resistivity Nickel ASTM B160 1.000E-07 ohm m

Electrical resistivity Steel AISI 304 7.200E-07 ohm m

Electrical resistivity Steel AISI C1020 1.000E-07 ohm m

Heat capacity Air 1006 J/kg C

Heat capacity Aluminum 2024-T3 963.00 J/kg C

Heat capacity Aluminum 6061-T6 963.00 J/kg C

Heat capacity Aluminum 7079-T6 963.00 J/kg C

Heat capacity Beryllium QMV 1884 J/kg C

Heat capacity Borosilicate glass 710.00 J/kg C

Heat capacity Concrete 1000 J/kg C

Heat capacity Copper - pure 385.00 J/kg C

Heat capacity Dow Corning 200 (350 cST) 1465 J/kg C

Heat capacity Ethanol (25 C) 2453 J/kg C

Heat capacity Gold - pure 130.00 J/kg C

Heat capacity Ice 2093 J/kg C

Heat capacity Iron 440.00 J/kg C

Heat capacity Lead - pure 130.00 J/kg C

Heat capacity Magnesium AZ31B-H24 1047 J/kg C

Heat capacity Magnesium HK31A-H24 544.00 J/kg C

Heat capacity Methanol (25 C) 2547 J/kg C

Heat capacity Molybdenum - wrought 293.00 J/kg C

Heat capacity Nickel - pure 461.00 J/kg C

Heat capacity Platinum 130.00 J/kg C

Heat capacity SiC Alpha 1300 J/kg C

Heat capacity SiC sintered KT 1340 J/kg C

Heat capacity Silica (0 C) 937.00 J/kg C

Heat capacity Silver - pure 235.00 J/kg C

Heat capacity Steel AISI 304 503.00 J/kg C

Heat capacity Steel AISI C1020 419.00 J/kg C

Heat capacity Tantalum 126.00 J/kg C

Heat capacity Titanium B 120VCA 544.00 J/kg C

Heat capacity Tungsten 138.00 J/kg C

Heat capacity Water 4216 J/kg C

Heat of combustion Methane 55.70 MJ/kg

Heat of combustion Octane 47.70 MJ/kg

Heat of fusion Nitrogen 25.50 kJ/kg

Heat of fusion Water 334.00 kJ/kg

Heat of vaporization Ammonia 1368 kJ/kg

Heat of vaporization Argon 162.76 kJ/kg

Heat of vaporization Helium 23.93 kJ/kg

Heat of vaporization Hydrogen 451.90 kJ/kg

Heat of vaporization Methane 577.40 kJ/kg

Heat of vaporization Neon 87.03 kJ/kg

Heat of vaporization Nitrogen 199.20 kJ/kg

Heat of vaporization Water (100 C) 2258 kJ/kg

Heat transfer coef. Air v = 0 m/s 5.6000 W/ C m^2

Heat transfer coef. Air v = 3.4 m/s 18.90 W/ C m^2

Heat transfer coef. Air v = 6.7 m/s 38.00 W/ C m^2

Kinematic viscosity Air (101 kPa) 1.800E-05 m^2/s

Kinematic viscosity Dow Corning 200 (350cSt) 1.121E-07 m^2/s

Kinematic viscosity Water (0 C) 1.753E-06 m^2/s

Poisson's ratio Aluminum 2024-T3 0.3300

Poisson's ratio Aluminum 6061-T6 0.3300

Poisson's ratio Aluminum 7079-&6 0.3300

Poisson's ratio Beryllium QMV 0.0300

Poisson's ratio Borosilicate Ohara E6 0.1950

Poisson's ratio Borosilicate Tempax 0.2200

Poisson's ratio Copper - pure

Poisson's ratio Gold - pure 0.4200

Poisson's ratio Lead - pure 0.4200

Poisson's ratio Magnesium AZ31B-H24 0.3500

Poisson's ratio Magnesium HK31A-H24 0.3500

Poisson's ratio Molybdenum - wrought 0.3200

Poisson's ratio Nickel - pure

Poisson's ratio Platinum 0.3900

Poisson's ratio Silver - pure 0.3700

Poisson's ratio Steel AISI 304 0.2900

Poisson's ratio Steel AISI C1020 0.2900

Poisson's ratio Tantalum 0.3500

Poisson's ratio Titanium B 120VCA 0.3000

Poisson's ratio Tungsten 0.2800

Thermal expansion coefficient Aluminum 2024-T3 22.68 microns/m C

Thermal expansion coefficient Aluminum 6061-T6 24.30 microns/m C

Thermal expansion coefficient Aluminum 7079-T6 24.66 microns/m C

Thermal expansion coefficient Beryllium QMV 14.94 microns/m C

Thermal expansion coefficient Borosilicate E6 -30 to +70C 2.8000 microns/m C

Thermal expansion coefficient Copper - pure 16.56 microns/m C

Thermal expansion coefficient Gold - pure 4.39 microns/m C

Thermal expansion coefficient Lead - pure 52.74 microns/m C

Thermal expansion coefficient Magnesium AZ31V-H24 26.10 microns/m C

Thermal expansion coefficient Magnesium HK31A-H24 25.20 microns/m C

Thermal expansion coefficient Molybvdenum - wrought 5.4000 microns/m C

Thermal expansion coefficient Nickel - pure 12.96 microns/m C

Thermal expansion coefficient Platinum 9.0000 microns/m C

Thermal expansion coefficient SiC Alpha 4.0000 microns/m C

Thermal expansion coefficient SiC sintered KT 5.0000 microns/m C

Thermal expansion coefficient Silver - pure 19.80 microns/m C

Thermal expansion coefficient Steel AISI 304 17.82 microns/m C

Thermal expansion coefficient Steel AISI C1020 11.34 microns/m C

Thermal expansion coefficient Tantalum 6.4800 microns/m C

Thermal expansion coefficient Titanium B 120VCA 9.3600 microns/m C

Thermal expansion coefficient Tungsten 4.5000 microns/m C

Viscosity Air (0 C,101 kPa) 1.708E-05 N s/m^2

Viscosity Carbon dioxide (0 C,101 kPa) 1.390E-05 N s/m^2

Viscosity Helium (0 C,101 kPa) 1.860E-05 N s/m^2

Viscosity Hydrogen (0 C,101 kPa) 8.345E-06 N s/m^2

Viscosity Methane (0 C,101 kPa) 1.026E-05 N s/m^2

Viscosity Nitrogen (0 C,101 kPa) 1.660E-05 N s/m^2

Viscosity Oxygen (0 C,101 kPa) 1.919E-05 N s/m^2

Viscosity Benzene (0 C) 9.121E-04 N s/m^2

Viscosity Carbon tetrachloride (0 C) 1.346E-03 N s/m^2

Viscosity Glycerin (0 C) 12.07 N s/m^2

Viscosity Kerosene (0 C) 2.959E-03 N s/m^2

Viscosity Mercury (0 C) 1.685E-03 N s/m^2

Viscosity Oil - light machine (0 C) 0.3534 N s/m^2

Viscosity Water (0 C) 1.753E-03 N s/m^2

Date created: 9/26/95
Last modified: 04/05/98
Copyright © 1995, 1996, 1997, 1998 Walter A. Siegmund
Walter A. Siegmund

Physical constants

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This is a short list of physical constants in SI units.

Avogadro's number	N	6.02E+23	mole^-1
Boltzmann constant	k	1.381E-23	J/ K
Electric charge	e	1.602E-19	coul
Gas constant	R	8.3145	J/ K mole
Gravitation	G	6.672E-11	N m^2/kg^2
Mass	electron	9.11E-31	kg
Mass	proton	1.67E-27	kg
Mass	neuton	1.68E-27	kg
Mass	alpha-particle	6.64E-27	kg
Plank's	h	6.626E-34	J s
Plank's	hc	1.986E-25	J m
Plank's	hc/k	1.439E-02	m C
Radiation constant	hc^2	5.955E-17	W m^2
Speed of light	c	2.998E+08	m/s
Stefan-Boltzmann	sigma	5.6705E-08	W/m^2 K^4

Astronomical constants

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This is a short list of astronomical constants in SI units.

Acceleration	Sea level	9.8067	m/s^2
Luminosity	Sun	3.826E+26	J/s
Mass	Sun	1.989E+30	kg
Mass	Earth	5.976E+24	kg
Pressure	Sea level	1.013E+05	Pa
Radius	Earth	6.371E+06	m
Radius	Sun	6.970E+08	m
Velocity	Earth's orbital	2.978E+04	m/s

NIST Table of Fundamental Physical Constants

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This data is derived from the 1986 CODATA recommended values of the fundamental physical constants. It is not intended to be an authoritative source: typographical errors are possible and the data has been reformatted. You can find the more complete information from the NIST at http://physics.nist.gov/PhysRefData/codata86/codata86.html.

# Constant Symbol Value Units
1 Speed of light in vacuum (c) 299792458 m s^-1
2 Permeability of vacuum (mu_0) 1.25663706143592e-06 N A^-2
3 Permittivity of vacuum (epsilon_0) 8.854187817e-12 F m^-1
4 Newtonian constant of gravitation (G) 6.67259e-11 ± 8.5e-15 m³ kg^-1 s^-2
5 Planck constant (h) 6.6260755e-34 ± 4.0e-40 J s
6 Planck constant in eV 4.1356692e-15 ± 1.2e-21 eV s
7 h-bar (h-bar) 1.05457266e-34 ± 6.3e-41 J s
8 h-bar in eV 6.582122e-16 ± 2.0e-22 eV s
9 Planck mass (m_p) 2.17671e-08 ± 1.4e-12 kg
10 Planck length (l_p) 1.61605e-35 ± 1.0e-39 m
11 Planck time (t_p) 5.39056e-44 ± 3.4e-48 s
12 Elementary charge (e) 1.60217733e-19 ± 4.9e-26 C
13 Magnetic flux quantum (Phi_0) 2.06783461e-15 ± 6.1e-22 Wb
14 Josephson frequency-voltage quotient 483597670000000 ± 1.4e+08 V^-1 s^-1
15 Quantized Hall conductance 3.87404614e-05 ± 1.7e-12 Omega^-1
16 Quantized Hall resistance (R_H) 25812.8056 ± 0.0012 Omega
17 Bohr magneton (mu_B) 9.2740154e-24 ± 3.1e-30 J T^-1
18 Bohr magneton in eV 5.78838263e-05 ± 5.2e-12 eV T^-1
19 Bohr magneton in Hz 13996241800 ± 4200 T^-1 s^-1
20 Bohr magneton in wavenumbers 46.686437 ± 1.4e-05 m^-1 T^-1
21 Bohr magneton in kelvins 0.6717099 ± 5.7e-06 K T^-1
22 Nuclear magneton (mu_N) 5.0507866e-27 ± 1.7e-33 J T^-1
23 Nuclear magneton in eV 3.15245166e-08 ± 2.8e-15 eV T^-1
24 Nuclear magneton in Hz 7622591.4 ± 2.3 T^-1 s^-1
25 Nuclear magneton in wavenumbers 0.0254262281 ± 7.7e-09 m^-1 T^-1
26 Nuclear magneton in kelvins 0.0003658246 ± 3.1e-09 K T^-1
27 Fine structure constant (alpha) 0.00729735308 ± 3.3e-10
28 Inverse fine structure constant 137.0359895 ± 6.1e-06
29 Rydberg constant (Ry) 10973731.534 ± 0.013 m^-1
30 Rydberg constant in Hz 3.2898419499e+15 ± 3.9e+06 s^-1
31 Rydberg constant in joules 2.1798741e-18 ± 1.3e-24 J
32 Rydberg constant in eV 13.6056981 ± 4.0e-06 eV
33 Bohr radius (a_0) 5.29177249e-11 ± 2.4e-18 m
34 Hartree energy (E_h) 4.3597482e-18 ± 2.6e-24 J
35 Hartree energy in eV 27.2113961 ± 8.1e-06 eV
36 Quantum of circulation 0.000363694807 ± 3.3e-11 m² s^-1
37 Electron mass (m_e) 9.1093897e-31 ± 5.4e-37 kg
38 Electron mass in u 0.000548579903 ± 1.3e-11 u
39 Electron mass in eV 510999.06 ± 0.15 eV
40 Electron-muon mass ratio 0.00483633218 ± 7.1e-10
41 Electron-proton mass ratio 0.000544617013 ± 1.1e-11
42 Electron-deuteron mass ratio 0.000272443707 ± 6e-12
43 Electron-alpha-particle mass ratio 0.000137093354 ± 3e-12
44 Electron specific charge -175881962000 ± -53000 C kg^-1
45 Electron molar mass 5.48579903e-07 ± 1.3e-14 kg mol^-1
46 Electron Compton wavelength (lambda_C) 2.42631058e-12 ± 2.2e-19 m
47 Electron Compton wavelength over 2 pi (lambda-bar_C) 3.86159323e-13 ± 3.5e-20 m
48 Electron classical radius (r_e) 2.81794092e-15 ± 3.8e-22 m
49 Electron Thomson cross section (sigma_e) 6.6524616e-29 ± 1.8e-35 m²
50 Electron magnetic moment 9.2847701e-24 ± 3.1e-30 J T^-1
51 Electron magnetic moment in Bohr magnetons 1.001159652193 ± 1.0e-11
52 Electron magnetic moment in nuclear magnetons 1838.282 ± 3.7e-05
53 Electron magnetic moment anomaly (a_e) 0.001159652193 ± 1.0e-11
54 Electron g-factor (g_e) 2.002319304386 ± 2.0e-11
55 Electron-muon magnetic moment ratio 206.766967 ± 3.0e-05
56 Electron-proton magnetic moment ratio 658.2106881 ± 6.6e-06
57 Muon mass 1.8835327e-28 ± 1.1e-34 kg
58 Muon mass in u 0.113428913 ± 1.7e-08 u
59 Muon mass in eV 105658389 ± 34 eV
60 Muon-electron mass ratio 206.768262 ± 3.0e-05
61 Muon molar mass 0.000113428913 ± 1.7e-11 kg mol^-1
62 Muon magnetic moment 4.4904514e-26 ± 1.5e-32 J T^-1
63 Muon magnetic moment in Bohr magnetons 0.00484197097 ± 7.1e-10
64 Muon magnetic moment in nuclear magnetons 8.8905981 ± 1.3e-06
65 Muon magnetic moment anomaly (a_mu) 0.001165923 ± 8.4e-09
66 Muon g-factor (g_mu) 2.002331846 ± 1.7e-08
67 Muon-proton magnetic moment ratio 3.18334547 ± 4.7e-07
68 Proton mass (m_p) 1.6726231e-27 ± 1.0e-33 kg
69 Proton mass in u 1.00727647 ± 1.2e-08 u
70 Proton mass in eV 938272310 ± 280 eV
71 Proton-electron mass ratio 1836.152701 ± 3.7e-05
72 Proton-muon mass ratio 8.8802444 ± 1.3e-06
73 Proton specific charge 95788309 ± 29 C kg^-1
74 Proton molar mass 0.00100727647 ± 1.2e-11 kg mol^-1
75 Proton Compton wavelength (lambda_C,p) 1.32141002e-15 ± 1.2e-22 m
76 Proton magnetic moment 1.41060761e-26 ± 4.7e-33 J T^-1
77 Proton magnetic moment in Bohr magnetons 0.001521032202 ± 1.5e-11
78 Proton magnetic moment in nuclear magnetons 2.792847386 ± 6.3e-08
79 Diamagnetic shielding correction for protons (H_2 O, spherical sample, 298.15 K) (sigma_H2O) 2.5689e-05 ± 1.5e-08
80 Shielded proton moment (H_2 O, spherical sample, 298.15 K) (mu_p') 1.41057138e-26 ± 4.7e-33 J T^-1
81 Shielded proton moment in Bohr magnetons 0.001520993129 ± 1.7e-11
82 Shielded proton moment in nuclear magnetons 2.792775642 ± 6.4e-08
83 Proton gyromagnetic ratio (gamma_p) 267522128 ± 81 T^-1 s^-1
84 (gamma_p) 42577469 ± 13 T^-1 s^-1
85 Proton gyromagnetic ratio, uncorrected (H_2 O, spherical sample, 298.15 K) (gamma_p') 267515255 ± 81 T^-1 s^-1
86 (gamma_p'/2pi) 42576375 ± 13 T^-1 s^-1
87 Neutron mass (m_n) 1.6749286e-27 ± 1.0e-33 kg
88 Neutron mass in u 1.008664904 ± 1.4e-08 u
89 Neutron mass in eV 939565630 ± 280 eV
90 Neutron-electron mass ratio 1838.683662 ± 4.0e-05
91 Neutron-proton mass ratio 1.001378404 ± 9e-09
92 Neutron molar mass 0.001008664904 ± 1.4e-11 kg mol^-1
93 Neutron Compton wavelength (lambda_C,n) 1.3195911e-15 ± 1.2e-22 m
94 Neutron magnetic moment 9.6623707e-27 ± 4.0e-33 J T^-1
95 Neutron magnetic moment in Bohr magnetons 0.00104187563 ± 2.5e-10
96 Neutron magnetic moment in nuclear magnetons 1.91304275 ± 4.5e-07
97 Neutron-electron magnetic moment ratio 0.00104066882 ± 2.5e-10
98 Neutron-proton magnetic moment ratio 0.68497934 ± 1.6e-07
99 Deuteron mass (m_d) 3.343586e-27 ± 2.0e-33 kg
100 Deuteron mass in u 2.013553214 ± 2.4e-08 u
101 Deuteron mass in eV 1875613390 ± 570 eV
102 Deuteron-electron mass ratio 3670.483014 ± 7.5e-05
103 Deuteron-proton mass ratio 1.999007496 ± 6e-09
104 Deuteron molar mass 0.002013553214 ± 2.4e-11 kg mol^-1
105 Deuteron magnetic moment (mu_d) 4.3307375e-27 ± 1.5e-33 J T^-1
106 Deuteron magnetic moment in Bohr magnetons 0.0004669754479 ± 9.1e-12
107 Deuteron magnetic moment in nuclear magnetons 0.85743823 ± 2.4e-08
108 Deuteron-electron magnetic moment ratio 0.000466434546 ± 9.1e-12
109 Deuteron-proton magnetic moment ratio 0.3070122035 ± 5.1e-09
110 Avagadro constant (N_A) 6.0221367e+23 ± 3.6e+17 mol^-1
111 Atomic mass constant (m_u) 1.6605402e-27 ± 1.0e-33 kg
112 Atomic mass constant in eV 931494320 ± 280 eV
113 Faraday constant (F) 96485.309 ± 0.029 C mol^-1
114 Molar Planck constant 3.99031323e-10 ± 3.6e-17 J s mol^-1
115 (N_A hc) 0.11962658 ± 1.1e-07 J m mol^-1
116 Molar gas constant (R) 8.31451 ± 7.0e-05 J mol^-1 K^-1
117 Boltzmann constant (k) 1.380658e-23 ± 1.2e-28 J K^-1
118 Boltzmann constant in eV 8.617385e-05 ± 7.3e-10 eV K^-1
119 Boltzmann constant in Hz 20836740000 ± 180000 K^-1 s^-1
120 Boltzmann constant in wavenumbers 69.50387 ± 0.00059 m^-1 K^-1
121 Molar volume (ideal gas), STP (V_m) 0.0224141 ± 1.9e-07 m³ mol^-1
122 Loschmidt constant (n_0) 2.686763e+25 ± 2.3e+20 m^-3
123 Stefan-Boltzmann constant (sigma) 5.67051e-08 ± 1.9e-12 W m^-2 K^-4
124 First radiation constant (c_1) 3.7417749e-16 ± 2.2e-22 W m²
125 Second radiation constant (c_2) 0.01438769 ± 1.2e-07 m K
126 Wien displacement law constant (b) 0.002897756 ± 2.4e-08 m K
127 Electron volt (eV) 1.60217733e-19 ± 4.9e-26 J
128 Atomic mass unit (u) 1.6605402e-27 ± 1.0e-33 kg
129 Standard atmosphere (atm) 101325 Pa
130 Standard acceleration of gravity (g_n) 9.80665 m s^-2
131 BIPM-maintained ohm, Omega_69-B1 as of 1 Jan 85 (Omega_B185) 1-1.563e-6 ± 5.0e-08 Omega
132 Drift rate of Omega_69-B1 (dOmega_69-B1/dt) -0.0566 ± -0.0015 muOmega/yr
133 BIPM-maintained volt 483 694 GHz(h/2e) (V_76-B1) 1-7.59e-6 ± 3.0e-07 V
134 BIPM maintained ampere A_BIPM (A_B185) 1-6.03e-6 ± 3.0e-07 A
135 Cu x-unit: (xu(CuKalpha1)) 1.00207789e-13 ± 7.0e-20 m
136 Mo x-unit: (xu(MoKalpha1)) 1.00209938e-13 ± 4.5e-20 m
137 AA *: (AAngstrom-star) 1.00001481e-10 ± 9.2e-17 m
138 Lattice spacing of Si (in vacuum, 295.65 K) (a) 5.4310196e-10 ± 1.1e-16 m
139 Lattice spacing Si (220) plane (d_220) 1.9201554e-10 ± 4.0e-17 m
140 Molar volume of Si (V_m(Si)) 1.20588179e-05 ± 8.9e-12 m³ mol^-1
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