Introduction | Units And Measurement | Notes | Summary - Zigya

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Units and Measurement

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Introduction

A quantity which can be measured and by which various physical happenings can be explained and expressed in form of laws is called a physical quantity. For example length, mass, time, force etc.

Measurement is necessary to determine the magnitude of a physical quantity, to compare two similar physical quantities and to prove physical laws or equations.

A physical quantity is represented completely by its magnitude and unit.

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