Science
Constants - A to B
Aa
|
Bb
A to B |
C to D
|
E to F
|
G to I
|
J to L
|
M
|
N to Q
|
R to T
|
U to Z
Aa
Name
Symbol
Value
Absolute Entropy Constant
S
0
/R
−1.164 8678 ± 0000044 at 1 K and 1 01 325 Pa
Absolute Zero
Acceleration of Free Fall on Earth
g
9.780 356 m s
−2
at sea level on the equator
9.812 420 m s
−2
at sea level in London
9.832 079 m s
−2
at sea level at the poles
Acceleration of free fall on the Sun
273.98 m s
-2
27.938
g
Acceleration of free fall on the Moon
1.62 m s
-2
0.165
g
Acre
4046.856 42240 m
2
Aeon
Eon
Astrophysical
10
9
years
Alpha particle mass
m
α
6.644 655 98 ± 0.00000052 × 10
-27
kg
4.001 506 1747 ± 0.0000000010 u
5.97191897 ± 0.00000047 × 10
-10
J/
c
2
3727.379 04 ± 0.00015 MeV/
c
2
Alpha particle to proton mass ratio
m
α
/m
p
3.972 599 6846 ± 0.0000000011
Alpha particle to electron mass ratio
m
α
/m
e
7294.299 508 ± 0.000016
Air, Critical Temperature of
-190 °C
183 K
Air, Density of
0.7734 m
3
kg
−1
1.2929 kg m
−3
Air, Viscosity of (20°C)
η
0
1.8 × 10
-5
N s m
−2
Alladi-Grinstead Constant
0.809 394 020 534
Ångström
Å
10
−10
m
Anker
8.5 UK gallons
38.641 765 × 10
-3
m
3
Année-lumière
ly
9.46052973 × 10
10
m
Apéry's Constant
ζ(3)
1.202 056 903
Apothecaries' Ounce
oz (apoth)
3.110 347 680 × 10
−2
kg
oz (ap.)
Archimedes' Constant
π
3.14 159 265 358 979 323 846 264 338 32795
Are
a
100 m
2
AU
Astronomical Unit
AU
1.495 978 706 60 ± 0.000 000 000 20 × 10
11
m
Atmospheric Pressure
Standard atmospheric pressure
1.01325 × 10
5
N m
−2
1.01325 bar
14.7 lbf in
−2
Atomic Mass Unit
Dalton
amu
1.660 53873 ± 0.00000013 × 10
−27
kg
m
u
931.494 013 ± 0.000037 MeV
u
1.492 41778 ± 0.00000012 × 10
−10
J
Avogadro Constant
N
A
6.022 14199 ± 0.00000047 × 10
23
mol
−1
Avoirdupois Ounce
oz (avdp)
2.834 952 313 × 10
−2
kg
oz (av.)
0.0625 lb (av.)
oz
16 drachms (av.)
Aa
|
Bb
To the top
|
To the bottom
A to B |
C to D
|
E to F
|
G to I
|
J to L
|
M
|
N to Q
|
R to T
|
U to Z
Bb
Name
Symbol
Value
Backhouse's Constant
1.456 074 948 582 689 671 399 595 351 116 54356
Base of Natural Logarithms
e
2.718 281 828 459 045 235 360 287 471 3526
Bar
bar
10
5
Pa
Barn
b
10
-28
m
2
Becquerel
Bq
Bernstein's Constant
β
0.280 169 4990
Board Foot
144 in
3
2.359 737 216 × 10
−3
m
3
Bohr Magneton
µ
B
9.274 00899 ± 0.00000037 × 10
−24
J T
−1
5.788 381 749 ± 0.00000043 × 10
−5
eV T
−1
1.399 624 624 ± 0.000000056 × 10
10
Hz T
−1
Bohr Radius
a
0
5.291 772 083 ± 0.000000019 × 10
−11
m
Boltzmann Constant
k
B
1.380 6503 ± 0.0000024 × 10
−23
J K
−11
8.617 342 ± 0.000015 × 10
−5
eV K
−11
2.083 6644 ± 0.0000036 × 10
10
Hz K
−11
Briggsian (common) logarithm of 2
log
10
2
0.301 029 995 663 981 19521
British thermal unit
Btu
1.055 06 × 10
3
J
Brun's Constant
B
1.9021605824
Bushel
64 pint
3.636 8704 × 10
-2
m
3
Bushel (US)
64 dry pints (US)
3.523 904 × 10
-2
m
3
Butt
108 gallons of beer (UK gallons in the UK, US gallons in the US)
126 gallons of wine (UK gallons in the UK, US gallons in the US)
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