# What is 1 Dyn

## SI units

SI = Système International d'unités

1. Size, name, symbol
2. SI prefixes
3. SI derived units
4. cgs units

### Size, name, symbol

length
Meter: m

Dimensions
Kilograms: kg

time
Second: s

electric current
Ampère: A

thermodynamic temperature
Kelvin: K

Amount of substance
Mole: mole

Light intensity
Candela: cd

### SI prefixes

Exponent (to base 10) of decimal numbers: E n = 10n

Factor prefix symbol 1024 E 24 yotta Y 1021 E 21 zetta Z 1018 E 18 exa E 1015 E 15 peta P 1012 E 12 tera T 109 E 9 giga G 106 E 6 mega M 103 E 3 kilo k 102 E 2 hecto h 101 E 1 deca da 10-1 E -1 deci d 10-2 E -2 centi c 10-3 E -3 milli m 10-6 E -6 micro µ 10-9 E -9 nano n 10-12 E-12 pico p 10-15 E-15 femto f 10-18 E-18 atto a 10-21 E-21 zepto z 10-24 E-24 yocto y

### SI derived units

(Note: all units to the right of the slash are in the denominator!)

frequency
Hertz: Hz = 1 / s

force
Newton: N = m kg / s2

Pressure, mechan. tension
Pascal: Pa = N / m2 = kg / m s2

Energy, work, amount of heat
Joule: J = N m = m2 kg / s2

power
Watt: W = J / s = m2 kg / s3

electric charge
Coulomb: C = s A

electrical voltage
Volt: V = W / A = m2 kg / s3 A.

capacity
Farad: F = C / V = ​​s4 A.2/ m2 kg

electrical resistance
Ohm: Omega = V / A = m2 kg / s3 A.2

electr. Conductance
Siemens: S = A / V = ​​s3 A.2/ m2 kg

magnetic river
Weber: Wb = V s = m2 kg / s2 A.

Magnetic induction
Tesla: T = Wb / m2 = kg / s2 A.

Inductance
Henry: H = Wb / A = m2 kg / s2 A.2

Luminous flux
Lumen: lm = cd sr

Illuminance
Lux: lx = lm / m2 = cd sr / m2

Becquerel: Bq = 1 / s

Gray: Gy = J / kg = m2/ s2

Dynamic viscosity
Pascal second: Pa s = kg / m s

Torque
Newton meter: N m = m2 kg / s2

Surface tension
Newtons per meter: N / m = kg / s2

Heat flux density
Watts per square meter: W / m2 = kg / s3

Heat capacity, entropy
Joules per Kelvin: J / K = m2 kg / s2 K

Specific heat capacity, specific entropy
Joules per kilogram Kelvin: J / kg K = m2/ s2 K

Specific energy
Joules per kilogram: J / kg = m2/ s2

Thermal conductivity
Watt per meter Kelvin: W / m K = m kg / s3 K

Energy density
Joules per cubic meter: J / m3 = kg / m s2

Electric field strength
Volt per meter: V / m = m kg / s3 A.

Electric charge density
Coulomb per cubic meter: C / m3 = s A / m3

Electric flux density
Coulomb per square meter: C / m2 = s A / m2

Influence
Farad per meter: F / m = s4 A.2/ m3 kg

permeability
Henry per meter: H / m = m kg / s2 A.2

Molar energy
Joules per mole: J / mol = m2 kg / s2 mol

Molar entropy, molar heat capacity
Joules per mole Kelvin: J / mol K = m2 kg / s2 K mol

Exposure
Coulomb per kilogram: C / kg = s A / kg

Absorbed dose rate
Gray per second: Gy / s = m2/ s3

### cgs units

erg
1 erg = 10-7 J

Dyne
1 dyn = 10-5 N

Poise
1 P = 1 dyn s / cm2 = 0.1 Pa s

Stokes
1 pc = 1 cm2/ s = 10-4 m2/ s

Gauss
1 G = 10-4 T

Oersted
1 Oe = (1000 / (4 pi)) A / m

Maxwell
1 Mx = 10-8 Wb

stilb
1 sb = 1 cd / cm2 = 104 cd / m2

Phot
1 ph = 104 lx 