UNIVERSAL

speed of light in vacuum

c, c ₀

299792458

ms ^{? 1}

(exact)

magnetic constant

? ₀

4 ? 10 ^{? 7}

NA ^{? 2}

=12.566370614 10 ^{? 7}

NA ^{? 2}

(exact)

electric constant 1/ ? ₀ c ²

? ₀

8.854187817 10 ^{? 12}

Fm ^{? 1}

(exact)

characteristic impedance of vacuum = ? ₀ c

Z ₀

376.730313461

?

(exact)

Newtonian constant of gravitation

G

6.6742(10) 10 ¹¹

m ³kg ^?1s ^{? 2}

1.5 10 ⁴

G/?c

6.7087(10) 10 ³⁹

(GeV/ c ²) ^{? 2}

1.5 10 ⁴

Planck constant

h

6.6260693(11) 10 ^{? 34}

J s

1.7 10 ^{? 7}

in eV s

4.13566743(35) 10 ^{? 15}

eVs

8.5 10 ^?8

h/2 ?

?

1.05457168(18) 10 ^{? 34}

Js

1.7 10 ⁷

in eV s

6.58211915(56) 10 ^{? 16}

eVs

8.5 10 ⁸

?c in MeV fm

197.326968(17)

MeV fm

8.5 10 ⁸

Planck mass (?c/G) ^{1 / 2}

m _P

2.17645(16) 10 ⁸

kg

7.5 10 ⁵

Planck temperature (?c ⁵ /G) ^1/2/ k

T _P

1.41679(11) 10 ³²

K

7.5 10 ^?5

Planck length ?/m _P c=(?G/c ³ ) ^1/2

l _P

1.61624(12) 10 ³⁵

m

7.5 10 ⁵

Planck time l _P /c=(?G/c ⁶ ) ^1/2

t _P

5.39121(40) 10 ⁴⁴

s

7.5 10 ⁶

ELECTROMAGNETIC

elementary charge

e

1.60217653(14) 10 ^{? 19}

C

8.5 10 ⁸

e/h

2.41798940(21) 10