Units of Measurement - Fundamental, Derived, Non SI Units | New Topic 2025 - Poly Notes Hub

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all units of measurement - poly notes hub

by: Arun PaulPosted on: February 7, 2025February 7, 2025

Units of Measurement – Fundamental, Derived, Non SI Units | New Topic 2025

In this note, we are going to know about some important Units of Measurement like Fundamental Units, Derived Units, and Common Non SI Units as well. Welcome to Poly Notes Hub, a leading destination for engineering notes for diploma and degree engineering students.

Author Name: Arun Paul

Different Types of Units of Measurement

Units of measurement are defined as some quantities used to express and compare physical qualities like length, mass, time, temperature, and so on. It serves as a measuring standard and maintains consistency in scientific, technical, and everyday applications.

Fundamental Units (Base Units)

These are the basic units defined by the International System of Units (SI).

Quantity	SI Unit	Symbol
Length	Meter	m
Mass	Kilogram	kg
Time	Second	s
Electric Current	Ampere	A
Temperature	Kelvin	K
Amount of Substance	Mole	mol
Luminous Intensity	Candela	cd

Derived Units

These are formed by combining fundamental units.

Quantity	SI Unit	Symbol
Area	Square meter	m²
Volume	Cubic meter	m³
Speed/Velocity	Meter per second	m/s
Acceleration	Meter per second²	m/s²
Force	Newton	N (kg·m/s²)
Pressure	Pascal	Pa (N/m²)
Energy	Joule	J (N·m)
Power	Watt	W (J/s)
Electric Charge	Coulomb	C (A·s)
Frequency	Hertz	Hz (1/s)

Common Non SI Units

These are frequently used but not part of the SI system.

Quantity	Unit	Symbol	SI Equivalent
Length	Inch	in	1 in = 0.0254 m
Length	Foot	ft	1 ft = 0.3048 m
Length	Mile	mi	1 mi = 1.609 km
Mass	Gram	g	1 g = 0.001 kg
Mass	Pound	lb	1 lb = 0.4536 kg
Time	Minute	min	1 min = 60 s
Time	Hour	h	1 h = 3600 s
Energy	Calorie	cal	1 cal = 4.184 J
Temperature	Celsius	°C	K = °C + 273.15

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Units of Measurement - Fundamental, Derived, Non SI Units | New Topic 2025 - Poly Notes Hub Units of Measurement - Fundamental, Derived, Non SI Units | New Topic 2025 - Poly Notes Hub Units of Measurement - Fundamental, Derived, Non SI Units | New Topic 2025 - Poly Notes Hub
Units of Measurement - Fundamental, Derived, Non SI Units | New Topic 2025 - Poly Notes Hub

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