Find out the fundamental units from the following table and mark them. Find out which unit is used to measure each of the physical quantity.
*Ampere
*Meter / second
*Kilogram
*Kilogram / meter
*Mole
*Kelvin
*Meter
*Kilogram meter / second
Answers
Answer:
Quantitative measurement is the cornerstone of modern science, but it has not always been so. The application of quantitative measurements to chemistry, for example, does not predate AD 1500. Quantitative measurement was developed for other purposes, as technology, and was only then adopted for scientific use. The system of weights and measures were developed on an ad hoc basis in different parts of the world. The most fundamental quantities measured were mass or weight, length or distance, and time. Systems of units for measuring these were developed from the very beginning of recorded history. Measurement of temperature was added in the sixteenth century, and measurement of electric current in the eighteenth century. More recently the amount of substance and luminous intensity have been added in the International System of Units, or SI.
The International System of Units or Systeme Internationale (SI) is an improved metric system adopted by the Eleventh General Conference of Weights and Measures in 1960. It is the universal measuring system used in all areas of science throughout the world. The entire SI system of measurement is constructed from seven base units, each of which represents a single physical quantity as shown in the table below.
Base Units of the International System
Quantity
Name of Unit
Unit Symbol
length
metre
m
mass
kilogram
kg
time
second
s
temperature
kelvin
K
amount of substance
mole
mol
electric current
ampere
A
luminous intensity
candela
cd
Like earlier versions of the metric system, the SI units can be designated as decimal fractions or multiples by the use of appropriate prefixes. The acceptable SI prefixes are given in the table below.
Prefixes of the International System
Factor
Prefix
Symbol
10+24
yotta
Y
10+21
zetta
Z
10+18
exa
E
10+15
peta
P
10+12
tera
T
10+9
giga
G
10+6
mega
M
10+3
kilo
k
10+2
hecta
h
10+1
deca
da
10-1
centi
c
10-2
deci
d
10-3
milli
m
10-6
micro
μ
10-9
nano
n
10-12
pico
p
10-15
femto
f
10-18
atto
a
10-21
zepto
z
10-24
yocto
y
Answer:
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