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State Tamil Nadu
Board State Board [Samacheer Kalvi]
Class 8th Standard
Subject Science
Medium English
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Samacheer Kalvi Class 8th Science Book

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Samacheer Kalvi Class 8th Science Chapter

Introduction:
Physics is the study of nature and natural phenomena. Physics is considered as the base of all science subjects. It is based on experimental observations. The principles and observations allow us to develop a deeper understanding of nature. Scientific theories are valid, only if they are confirmed through various experiments. Theories in physics use many physical quantities that have to be measured.

Measurement is the base of all scientific studies and experimentations. It plays a vital role in our daily life. It is the process of finding an unknown physical quantity by using a standard quantity. In this lesson, we will study about measurement in detail. We will also study about accuracy and precision, approximation and rounding off.

Unit Systems:
We need three things for a perfect measurement. They are: an instrument, a standard quantity and an acceptable unit.

Let us say that the length of the book be 30 cm. Here, the length is the physical quantity, ruler is the instrument, 30 is the magnitude and ‘cm’ is the unit. This process is called measurement.

In the above activity the values of all the students will not be same. Similarly, people in various parts of the world are using different systems of units for measurement.

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