Measurement in Science and Technology

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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.