SI derived units

SI derived quantities are derived from seven base SI units via a system of quantity equations.

1 - SI derived units with special names and symbols

The International System of Units (SI Units) has twenty-two derived units with special names and symbols.

The special names of SI derived units are written in lowercase letters when written in full name. But its symbol's first letter is written in capital letter, if the SI derived unit got its name from a scientist.

For example; The symbol for newton is N (written in capital letters), which is the unit of measurement of force. The unit of force got its name from Sir Isaac Newton, one among the great physicists ever lived.

Twenty-two (22 derived units) derived SI units with special names and symbols are listed in below table.

No.	Measurement	Full SI Unit name	Symbol used
1	Force	newton	N
2	Angle	radian	rad
3	Solid Angle	steradian	sr
4	Frequency	hertz	Hz
5	Pressure/Stress	pascal	Pa
6	Celsius Temperature	degree celsius	°C
7	Energy, Work, Quantity of Heat	joule	J
8	Power	Watt	W
9	Electric Charge	coulomb	C
10	Electric Potential Difference	volt	V
11	Electrical Capacitance	farad	F
12	Electric Resistance	ohm	Ω
13	Electric Conductance	siemens	S
14	Magnetic Flux	Weber	Wb
15	Magnetic Flux Density	tesla	T
16	Electrical Inductance	henry	H
17	Catalytic Activity	katal	kat
18	Luminous Flux	lumen	lm
19	Illuminance	lux	lx
20	Radioactivity	becquerel	Bq
21	Absorbed Dose	gray	Gy
22	Dose Equivalent	sievert	Sv

2 - SI derived units without special names and symbols

Only the above listed 22 SI derived units have approved special names and symbols. There are some other derived units without special names or symbols. These derived units are expressed in terms of its base SI units.

For example; the SI derived unit of momentum has no special name. Momentum of an object is its mass multiplied by its velocity. SI unit for mass is kg and velocity is m/s.

So, the symbol of momentum is expressed in "kg m/s".

Some derived SI units without special names and symbols are listed in below table.

No.	Measurement	Full SI Unit name	Symbol used
1	area	meter squared	m2
2	volume	cubic meter	m3
3	speed/velocity	meter per second	m/s
4	acceleration	meter per second squared	m/s2
5	density	kilogram per cubic meter	kg/m3
6	specific volume	cubic meter per kilogram	m3/kg
7	concentration	mole per cubic meter	mol/m3
8	momentum	kg meter per second	kgm/sec
9	angular momentum	kg meter squared per second	kgm2/sec