NonUniform Motion  d  v_{1}  v_{2}  t  a 
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Quantity  Symbol  Value 
Speed of light in a vacuum  c  2.9979 × 10^{8} m/s (exact) 
Planck's constant  h  6.6260 × 10^{–34} J·s 
Universal gas constant  R  0.08205 L·atm/(mol·K)
8.3145 J/(mol·K) 8.3145 m^{3}·Pa/(mol·K) 8.3145 L·kPa/(mol·K) 0.083145 L·bar/(mol·K) 62.364 L·Torr/(mol·K) 
Avogadro constant  N_{A}  6.0221 × 10^{23} formula units/mol 
Mass of an electron  m_{e}  9.10938 × 10^{–28} g
5.4858 × 10^{–4} amu 
Mass of a proton  m_{p}  1.67262 × 10^{−24} g
1.00727 amu 
Mass of a neutron  m_{n}  1.674927 × 10^{−24} g
1.00866 amu 
Charge on an electron  e  –1.60217 × 10^{–19} C 
Boltzmann constant  k  1.3806 × 10^{–23} J/K 
Faraday constant  F  96485 C/mol of electrons 
Rydberg constant  R_{H}  1.09737 × 10^{7} m^{–1}
2.179872 × 10^{–18} J 3.289842 × 10^{15} s^{–1} 
Electric constant  ε_{0}  8.85418 × 10^{–12} F/m
8.85418 × 10^{–}^{12} C^{2}/(J·m) 
Length
1 in = 2.54 cm (exact) 1 Å = 1 × 10^{–10} m 1 mi = 5280 ft 1 mi = 1609.3 m 1 ft = 0.3048 m 1 m = 1.094 yd 1 km = 0.621 miles(mi) Volume 1 mL = 1 cm^{3} 1 L = 1.0567 qt 1 gal = 3.7854 L 1 m^{3} = 1000 L Mass 1 lb = 453.6 g 1 g = 6.022 × 10^{23} amu 1 kg = 2.20 lb 1 lb = 16 oz 1 oz = 28.35 g 1 ton = 2000 lb 1 metric ton = 1 Mg 
Energy
1 cal = 4.184 J 1 L·atm = 101.325 J 1 eV = 1.602 × 10^{–19} J 1 J = 1 kg·m^{2}/s^{2}1 J = 1 m^{3}·Pa 1 J = 1 L·kPa 1 J = 1 C·V Pressure 1 atm = 760 Torr 1 atm = 760 mmHg 1 atm = 101325 Pa 1 atm = 14.7 psi 1 atm = 1.01325 bar 1 bar = 100 kPa 1 Torr = 1 mmHg Temperature T_{K} = T_{C} + 273.15 T_{C }= (5/9)(T_{F} – 32) T_{F }= 32 + (9/5)T_{C} 
10^{x} 
Prefix^{ }

Symbol^{ }

10^{15}  peta  P 
10^{12}  tera  T 
10^{9}  giga  G 
10^{6}  mega  M 
10^{3}  kilo  k 
10^{2}  hecto  h 
10^{1}  deca  da 
10^{−1}  deci  d 
10^{−2}  centi  c 
10^{−3}  milli  m 
10^{−6}  micro  µ 
10^{−9}  nano  n 
10^{−12}  pico  p 
10^{−15}  femto  f 