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Principal Quantity and Derivative Quantity


Principal Quantities and Derivative Quantities and Their Units in (International Units)

This time we will discuss the principal quantities and complete derivative quantities and their units.

The quantity itself is anything that can be measured, calculated and expressed in numbers and has units.

While the unit is something that is used to express the size of a quantity, or a comparison in measuring a quantity.

The quantities can be grouped into 2, namely:

 Base Quantities

 Derived Quantities

The two quantities have different definitions, along with an explanation of the principal quantities and derivative quantities:

 Principal quantity

Base quantities are quantities whose units have been predetermined, stand alone and cannot be translated from other quantities. There are seven main quantities that have been formulated and agreed upon by experts. Examples of derived quantities are length, mass and time.

Each quantity has a unit and is expressed in international units, or also known as MKS (m.kg, s). An international unit is a unit that has been agreed upon internationally and is used by various countries.

The following is a table of principal quantities and units,

    Principal amount

Magnitude Symbol

 Unit

Unit Symbol

Long

l

meter

m

Mass

m

kilogram

kg

Time

t

sekon

s

Electric current

I

ampere

A

Temperature

T

kelvin

K

Amount of substance

n

mol

mol

Light intensity

l

kandela

cd


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