🔴 SIGNIFICANT FIGURES (Part - 1) || Basics || in HINDI for Class 11

In this Physics video in Hindi for class 11 we explained what are significant figures or significant digits and their rules.
Rules :-
1) All the non zero digits are significant digits.
2) All the leading zeroes are insignificant.
3) All the zeroes between non zero digits are significant digits.
4) If the number contains the decimal point, the trailing zeroes are significant figures, otherwise, those are insignificant.
🔴 Link for the playlist of this chapter (Units and Measurement):
• Units and Measurement ...

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[@MathS_369]

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[@dipikaparmar2320]

Very good explaination
But I have 1 question- why 10^24 is not considered as significant figures..??

[@Shahid_x1]

It doesn't represent the actual value/amount, but it indicates how much the decimal point would be displaced.

[@RadhaKrishna-yn9fq]

I watched many videos and I had many queries in my mind eg, why '0' between non zero digits are significant. But after watching this my all doubts are cleared ..
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Ekdam Super !!!!!!!! Sir. You explained which digit is considered significant and why ?

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What is the significant number of 12eggs ?

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@@thefallingapple1145 No, it's 2, there are no trailing zeros and decimal point in 12

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How many significant figure in :(a) speed of light .
(b)0.0000

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The majority of physics texts composed before 1980 do not include significant figure rules.The apparent lack of significant figure rules in physics texts in the first half of the 20th century is most likely due to the popularity of the slide rule. The slide rule is a device that allows the user to perform a calculation (multiplication, division, square root, etc.) for two values by sliding a scaled ruler. The number of significant figures in the computed answer is limited by the precision of the ruler, typically to three digits. In the preface to the introductory physics text Physics in Two Volumes published in 1974,26 Donald Ivey explains as much: “The numbers are invented and I can invent them to the degree of accuracy I please. In general I shall use simple numbers, so that calculations will not be messy, and the numbers are to be assumed as exact, unless otherwise indicated. In general, calculations should be carried out with slide rule accuracy, and answers will be given to three figures.” As the slide rule limits the precision of calculations, this eliminates the need for the significant figure rules in solving textbook problems. Moreover, this practice of giving answers to three figures is still carried out in modern texts,and may be a remnant of the slide rule era. The explosion of significant figure rules in physics texts in the 1980s is almost certainly due to the widespread use of the calculator. Texts that mention the slide rule do not have a section devoted to significant figures ,while texts that mention the calculator do have a significant figures section. In Sears and Zemansky’s popular text University Physics, the authors remark in the 1982 edition,30 “You may do the arithmetic with a calculator having a display with five to 10 digits. But you should not give a 10-digit answer for a calculation using numbers with three significant figures. To do so is not only unnecessary but it is also genuinely wrong because it misrepresents the precision of the results.” However, in the 1970 edition28 the authors have the opposite problem. In 1970 they need to remind students to give more precision, and in one particular problem they remark, “[The] computation must be carried out to four significant figures, which is beyond the precision of an ordinary slide rule and requires the use of four-place logarithms.” Thus, the introduction of the significant figure rules into physics texts is most likely a response to careless students writing down the 10 digits shown on their calculator.

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Sir I have doubt that leading zeros has to be significant figure I think because , let we have number 0.07km = 70m , if leading zero has no significant tha we can write 0.07km as 0.7km which is equal to 700m , so

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620×10^2

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Is significant shows uncertainty or certainty

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