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Chapter 1.3 Physical Quantities and Their Units - Coggle Diagram
Chapter 1.3 Physical Quantities and Their Units
Physical quantities and their units
S.I. unit
metre
kilogram
second
kelvin
ampere
Symbol of S.I unit
m
kg
s
K
A
Recall the measurements that you have learned in primary school. A physical quantity in science is defined as a physical characteristic that can be measured. The common base quantities used are length, mass, time, temperature and electric current.
The International System of Units, known as S.I. units (Système Internationale d'Unités) is used for the consistency of measurement. This allows accurate exchange of data and scientific knowledge to the entire world.
Prefixes can be used if the value of a physical quantity unit is too big or too small.
Value
1,000,000,000
1,000,000
1,000
0.1
0.01
0.001
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Standard form
10^9
10^6
10^3
10^-1
10^-2
10^-3
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Prefix
giga
mega
kilo
deci
centi
milli
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Symbol
G
M
k
d
c
m
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The Importance of S.I units in life
Inconsistencies of units used in daily life may cause a lot of problems. For example, people in certain places may measure things by using pound and ounce, whereas people in other places may use grain and stone. The use of a standard unit for measurement will make it easier for scientists to communicate at international level. Problems shown in the situations below may arise if we do not use standard units.
Span
Fathom
Pace
Cubit
