Understanding base quantities and derived quantities

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Malaysia SPM Form 4, Chapter 1: Introduction to Physics
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Contents 1 Physical Quantities 1.1 Base Quantities 1.2 Derived Quantities 2 Standard Form 3 Prefixes 4 Expressing Derived Quantities and Their Units in Terms of Base Quantities and Base Units 5 Solving Problems Involving Conversion of Units 6 Frequenly Asked Question 7 Additional notes 8 External Links

Physical Quantities

1. A physical quantity is a quantity that can be measured.
2. A physical quantity can be divided into base quantity and derived quantity.

Base Quantities

1. Base quantities are the quantities that are conventionally accepted as functionally independent of one another.
2. It is a quantity that cannot be defined in term of other physical quantity.
3. The base quantities and its units are as in the table below:

The Base Quantities

Quantity	Name of unit	Unit symbol
Length	metre	m
Mass	kilogram	kg
Time	second	s
Electric current	ampere	A
Thermodynamic temperature	Kelvin	K
Amount of substance	mole	mol
Luminous intensity	candela	cd

[Notes: Amount of substance and Luminous intensity are not discussed in SPM physics syllabus.]

Derived Quantities

Standard Form

Prefixes

Expressing Derived Quantities and Their Units in Terms of Base Quantities and Base Units

Solving Problems Involving Conversion of Units

Frequenly Asked Question

Additional notes

[Additional notes content information relates to this topic but may not be in the SPM syllabus]

External Links

NIST: Physical Quantity Technick Physchem Learn Physics Today Physchem