Measurement in Science and Technology
The Modern Measurement Systems
SI Units
How do we use SI Prefixes?
SI Prefixes
Derived Units
The SI units are based on 7 base units.
SI is an abbereviation of the French
name ""Le Systeme Internationale de Unite s "
The SI units was adopted at the 11th General
Conference of Weigths and Measures in 1960.
After French Revolution , the French scientists
took lead to establish a new system of weigths and measures.
How Did Our Ancestors Make Measurements ?
Indian Measurement System
British Period
After Independence
Rati, Masha, Tola ,
Chhatank, Seer and Maund
Before Independence
Grain, Ounces, Pounds,etc.
Ancient Period
Yojan
Anglus
Parmanu
In the Mohen-jodaro era the bricks were in the
ratio 4:2:1.
Lunar cycles was used for long durations
Shadows of trees and other objects
Need For Standard Unit
Furlongs
Mile
Yard
Egyptian Standard Cubit
Cubit , Hand Span, Fathom, Digit , Foot.
What Is A Measurement?
Characteristics Of A Unit
well defined
convenient
relevant
What Is A Unit?
A unit is anything in terms of which we
we make physical measurement.
Why Do We Need Measurement?
We need for everything. It is an essential activity
in our everyday life.
Define Measurement
Measurement is defined to be the couniting of
the number of times of a chosen scale.
