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