a. C.G.S: it is also known as centimetregramsecond system. In this system the length, mass and time is measured in centimetre, gram and seconds respectively. It is a French metric system of unit.
b. M.K.S: it is also known as metrekilogramsecond system. In this system the length, mass and time is measured in metre, kilogram and second respectively.
c. F.P.S: it is also known as footpoundsecond system. In this system the length, mass and time is measured in foot, pound and seconds respectively.
d. S.I: it stands for standard international system. This system is used over all the above systems and it is universally accepted.
MULTIPLE 
PREFIX 
SYMBOL 
10^{24} 
Yocto 
y 
10^{21} 
Zepto 
z 
10^{18} 
Atto 
a 
10^{16} 
Femto 
f 
10^{12} 
Pico 
p 
10^{9} 
Nano 
n 
10^{6} 
Micro 

10^{3} 
Milli 
m 
10^{2} 
Centi 
c 
10^{1} 
Deci 
d 
10 
Deca 
da 
10^{2} 
Hector 
h 
10^{3} 
Kilo 
k 
10^{6} 
Mega 
M 
10^{9} 
Giga 
G 
10^{12} 
Tera 
T 
10^{15} 
Peta 
P 
10^{18} 
Exa 
E 
10^{21} 
Zeta 
Z 
10^{24} 
yotta 
Y 
Fundamental quantity 
Unit 
Symbol 
Definition 
Unit of length 
metre 
m 
The metre is the length of the path travelled by light in vacuum during a time interval of 1/299792458 of as second. 
Unit of mass 
Kilogram 
kg 
It is equal to the mass of the international prototype of a kilogram. 
Unit of time 
seconds 
s 
The second is the duration of 9192631770 periods of radiation corresponding to the transition between the two hyperfine levels of the ground state of the caestum133 atom 
Unit of electric current 
ampere 
A 
The ampere is the constant current, which if maintained in two straight parallel conductors of infinite length of negligible circular cross section and placed 1 metre apart in vacuum 
Unit of temperature 
kelvin 
K 
It is fraction 1/273.16 of the thermodynamic temperature of the triple point of water (279.16) K. 
Unit of amount of substance 
mole 
mol 
It is the amount of substance of any system, which contains as many elementary entities as there are atoms in 0.012 kg of carbon12 
Unit of luminous intensity 
candela 
cd 
It is the luminous intensity, in a given direction of a source that emits monochromatic radiation of frequency in hertz and that has a radiant intensity in that direction of 1/683 watt per steradian. 
Derived quantities 
SI unit 
C.G.S unit 
speed 
m/s 
Cm/s 
force 
newton 
dyne 
density 
Kg/m^{3} 
g/m^{3} 
acceleration 
m/s^{2} 
Cm/s^{2} 
Posted By:
Harsh Mangrolia
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