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Fundamental Quantities and Their SI Units
• Length – metre (m)
• Mass – kilogram (kg)
• Time – second (s)
• Electric current – ampere (A)
• Temperature – kelvin (K)
• Amount of substance – mole (mol)
• Luminous intensity – candela (cd)
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Fundamental quantities in physics.
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Definition. Fundamental quantities are
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basic physical quantities that cannot be
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expressed in terms of other quantities.
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They form the foundation of all
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measurements in physics. Explanation. In
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physics, some quantities are considered
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basic because they are independent of
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one another. These quantities are
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measured directly and are not derived
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from any other physical quantity. All
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other physical quantities known as
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derived quantities are obtained by
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combining these fundamental quantities
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mathematically. Imagine imagine building
0:37
a house. You start with basic materials
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like bricks, cement and sand. In the
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same way, fundamental quantities are the
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basic building blocks used to measure
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and describe all physical phenomena. In
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simple terms, fundamental quantities are
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the basic measurements from which all
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other measurements are made. Formula
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Fundamental quantities do not have
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formulas because they are not derived
1:02
from other quantities. Key points.
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Fundamental quantities are independent.
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They are measured directly. They form
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the basis of derived quantities. Each
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has a standard unit. They are defined in
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the SI system. Fundamental quantities
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and their SI units. Length meter meter
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mass kilogram kilogram time second s
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electric current amp temperature kelvin
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K amount of substance mole mole luminous
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intensity candila cd examples measuring
1:36
the length of a table measuring the mass
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of a bag of rice measuring time taken
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for a race measuring electric current in
1:44
a circuit measuring temperature of
1:46
boiling water applications s scientific
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measurements, laboratory experiments,
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engineering and construction, electrical
1:55
and electronic systems, weather and
1:58
climate studies. Question: Why are
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fundamental quantities important in
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physics? Answer: Fundamental quantities
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are important because they serve as the
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basic reference quantities from which
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all other physical quantities are
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derived. Solved problem question. Which
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fundamental quantity is measured using a
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stopwatch and what is its SI unit?
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Answer. The fundamental quantity
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measured using a stopwatch is time and
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it's SI unit is the second