# What is 1 Dyn

## SI units

*Navigation path:*

SI = Système International d'unités

- Size, name, symbol
- SI prefixes
- SI derived units
- 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* = 10^{n}

^{24}E 24 yotta Y 10

^{21}E 21 zetta Z 10

^{18}E 18 exa E 10

^{15}E 15 peta P 10

^{12}E 12 tera T 10

^{9 }E 9 giga G 10

^{6 }E 6 mega M 10

^{3 }E 3 kilo k 10

^{2 }E 2 hecto h 10

^{1 }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 / s
^{2} **Pressure, mechan. tension**- Pascal: Pa = N / m
^{2}= kg / m s^{2} **Energy, work, amount of heat**- Joule: J = N m = m
^{2}kg / s^{2} **power**- Watt: W = J / s = m
^{2}kg / s^{3} **electric charge**- Coulomb: C = s A
**electrical voltage**- Volt: V = W / A = m
^{2}kg / s^{3}A. **capacity**- Farad: F = C / V = s
^{4}A.^{2}/ m^{2}kg **electrical resistance**- Ohm: Omega = V / A = m
^{2}kg / s^{3}A.^{2} **electr. Conductance**- Siemens: S = A / V = s
^{3}A.^{2}/ m^{2}kg **magnetic river**- Weber: Wb = V s = m
^{2}kg / s^{2}A. **Magnetic induction**- Tesla: T = Wb / m
^{2}= kg / s^{2}A. **Inductance**- Henry: H = Wb / A = m
^{2}kg / s^{2}A.^{2} **Luminous flux**- Lumen: lm = cd sr
**Illuminance**- Lux: lx = lm / m
^{2}= cd sr / m^{2} **radioactivity**- Becquerel: Bq = 1 / s
**Absorbed (radiation) dose**- Gray: Gy = J / kg = m
^{2}/ s^{2} **Dynamic viscosity**- Pascal second: Pa s = kg / m s
**Torque**- Newton meter: N m = m
^{2}kg / s^{2} **Surface tension**- Newtons per meter: N / m = kg / s
^{2} **Heat flux density**- Watts per square meter: W / m
^{2}= kg / s^{3} **Heat capacity, entropy**- Joules per Kelvin: J / K = m
^{2}kg / s^{2}K **Specific heat capacity, specific entropy**- Joules per kilogram Kelvin: J / kg K = m
^{2}/ s^{2}K **Specific energy**- Joules per kilogram: J / kg = m
^{2}/ s^{2} **Thermal conductivity**- Watt per meter Kelvin: W / m K = m kg / s
^{3}K **Energy density**- Joules per cubic meter: J / m
^{3}= kg / m s^{2} **Electric field strength**- Volt per meter: V / m = m kg / s
^{3}A. **Electric charge density**- Coulomb per cubic meter: C / m
^{3}= s A / m^{3} **Electric flux density**- Coulomb per square meter: C / m
^{2}= s A / m^{2} **Influence**- Farad per meter: F / m = s
^{4}A.^{2}/ m^{3}kg **permeability**- Henry per meter: H / m = m kg / s
^{2}A.^{2} **Molar energy**- Joules per mole: J / mol = m
^{2}kg / s^{2}mol **Molar entropy, molar heat capacity**- Joules per mole Kelvin: J / mol K = m
^{2}kg / s^{2}K mol **Exposure**- Coulomb per kilogram: C / kg = s A / kg
**Absorbed dose rate**- Gray per second: Gy / s = m
^{2}/ s^{3}

### cgs units

**erg**- 1 erg = 10
^{-7}J **Dyne**- 1 dyn = 10
^{-5}N **Poise**- 1 P = 1 dyn s / cm
^{2}= 0.1 Pa s **Stokes**- 1 pc = 1 cm
^{2}/ s = 10^{-4}m^{2}/ 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 / cm
^{2}= 10^{4}cd / m^{2} **Phot**- 1 ph = 10
^{4}lx

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