(i) Meter: The currently accepted definition of meter is the length of path travelled by light
in space in 1/299,792,458th second.
(ii) Kilogram: Kilogram is the fundamental unit of volume. It is described as the mass of
a specific cylinder of platinum -iridium kept at the International Bureau of Weights and
Measures in Paris.
(iii) Second: Second is the fundamental unit of time. It is described as 86,400th part of
Seem solar day. Second is accurately calculated by an atomic clock.
(iv) Coulomb: Coulomb is the fundamental unit of charge. It is described as the charge
needed to obtain 9´109 newton of force between two equal charges separated at a
distance of one meter in vacuum.
(v) Candle: Candle is the fundamental unit of luminous intensity. It is described as
luminous intensity observed from a source of monochromatic light of frequency
540*1012 Hz, that has an intensity of 1/683 watt per steradian.
(vi) Kelvin: Kelvin is the fundamental unit of temperature. It has quantity of zero
Where the molecular activity of gases ceases.
(vii) Mole: Mole is the fundamental unit of quantity of matter. It is described as
amount of material of a system that contains as many elementary molecules as
there are amount of 0.012 kg of carbon-12 (C-12).
Basic Physical Quantities
|
Physical quantity
|
Symbol
|
Dimension
|
Measurement unit
|
Unit
|
|
length
|
s
|
L
|
Meter
|
m
|
|
mass
|
M
|
M
|
Kilogram
|
Kg
|
|
time
|
t
|
T
|
Second
|
Sec
|
|
electric charge
|
q
|
Q
|
Coulomb
|
C
|
|
luminous intensity
|
I
|
C
|
Candle
|
Cd
|
|
temperature
|
T
|
K
|
Kelvin
|
oK
|
|
angle
|
θ
|
none
|
Radian
|
None
|
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