Question

Define - significant figures , scientific notation and dimensional analysis.​

Answer 1

$\bold{Answer}$

1. $\bold {SIGNIFICANT\: FIGURE}$-
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Digits of a number that are used to express it to the required degree of accuracy starting from the first non zero digit.

2.$\bold {SCIENTIFIC\: NATATION}$
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Exponential notation in which any number can be represented in the form N × 10^n where N = signal , non zero digit to the left of the decimal point.

3.$\bold {DIMENSIONAL\: ANALYSS}$
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Dimensional analysis - Any calculation involving the use of the dimensions of the different physical quantities involved is called $\bold {dimentional Analysis}$

Answer 2

$\huge{\texttt{\underline{\underline{Significant figures}}}}$

Significant figures is the number of digits that add to the significance of any number . It includes all the digits except the leading and trailing zeroes.This can be explained through an example :

5.607 has 4 significant figures .

0.203 has 3 significant figures .

$\huge{\texttt{\underline{\underline{Scientific notation}}}}$

Scientific notation is the process of multiplying a number with one place left to the decimal with the value of 10 expressed as the power of something .

56

The scientific notation is 5.6 × 10¹ .

6777

The scientific notation is 6.777 × 10³ .

$\huge{\texttt{\underline{\underline{Dimensional analysis}}}}$

A dimensional analysis refers to any calculation involving dimensions .

There are several dimensions and units also involve dimensions.