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Name  Base Unit  Symbol 
Enthalpy  joule  H 
Entropy  joule/Kelvin  S 
Heat capacity  joule/Kelvin  C 
Internal energy  joule  U 
Luminous intensity  candela  I 
Quantity of heat  joule  Q 
Radiant energy  joule  W 
Radiant intensity  watt/steradian  I 
Radiant power (flux)  watt  P 
Sound intensity  watt/meter  I 
Sound energy flux  watt  W 
Specific heat capacity  joule/(kilogram * Kelvin)  c 
Speed of sound  meter/second  n 
Thermal conductivity  watt/(meter * Kelvin)  l 
Time Constant  s  t 
Table 1. SI base units 



Table 2. Examples of SI derived units 

SI derived unit 

Derived quantity  Name  Symbol 

area  square meter  m^{2} 
volume  cubic meter  m^{3} 
speed, velocity  meter per second  m/s 
acceleration  meter per second squared  m/s^{2} 
wave number  reciprocal meter  m^{1} 
mass density  kilogram per cubic meter  kg/m^{3} 
specific volume  cubic meter per kilogram  m^{3}/kg 
current density  ampere per square meter  A/m^{2} 
magnetic field strength  ampere per meter  A/m 
amountofsubstance concentration  mole per cubic meter  mol/m^{3} 
luminance  candela per square meter  cd/m^{2} 
mass fraction  kilogram per kilogram, which may be represented by the number 1  kg/kg = 1 
For ease of understanding and convenience, 22 SI derived units have been given special names and symbols,
as shown in Table 3.
For a graphical illustration of how the 22 derived units with special names and symbols given in Table 3 are related to the seven SI base units, see relationships among SI units. Note on degree Celsius. The derived unit in Table 3 with the special name degree Celsius and special symbol °C deserves comment. Because of the way temperature scales used to be defined, it remains common practice to express a thermodynamic temperature, symbol T, in terms of its difference from the reference temperature T_{0 }= 273.15 K, the ice point. This temperature difference is called a Celsius temperature, symbol t, and is defined by the quantity equation t= T T_{0}. The unit of Celsius temperature is the degree Celsius, symbol °C. The numerical value of a Celsius temperature t expressed in degrees Celsius is given by t/°C = T/K  273.15. It follows from the definition of t that the degree Celsius is equal in magnitude to the kelvin, which in turn implies that the numerical value of a given temperature difference or temperature interval whose value is expressed in the unit degree Celsius (°C) is equal to the numerical value of the same difference or interval when its value is expressed in the unit kelvin (K). Thus, temperature differences or temperature intervals may be expressed in either the degree Celsius or the kelvin using the same numerical value. For example, the Celsius temperature difference t and the thermodynamic temperature difference T between the melting point of gallium and the triple point of water may be written as t = 29.7546 °C = T = 29.7546 K. The special names and symbols of the 22 SI derived units with special names and symbols given in Table 3 may themselves be included in the names and symbols of other SI derived units, as shown in Table 4.

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