SYSTEM OF UNITS

1

DIMENSION

The measurable properties used to describe

the physical state of the body or system are

known as its dimensions

For example length, mass, volume etc

2

UNITS

For determining the magnitude of any

dimension we use agreed units of

measurements such as

For length we use meter, ft etc

3

THE SI SYSTEM OF UNITS

The SI system consists of six primaryunits, from which all quantities may be

described

Secondary units are used in general practice

which are made from combinations of

these primary units

4

PRIMARY UNITS

5

Quantity SI Unit Dimension

Length Meter, m L

Mass Kilogram, Kg M

Time Seconds, s T

Temperature Kelvin, K θ

Current Ampere, A I

Luminosity Candela, Cd Cd

DERIVED UNITS

6