Q. What is the difference between Precision, and Accuracy? 


Answer:

Precision: In the measurement, the precise value is one whose values are close to each other (observer Values). For example:

Observers A, B, and C measured the length of a table which is 10.35 m, 10.50 m, and 11.00 m respectively.  But the actual length of the table is 14 m.

So the observer's values are close to each other, so it's called précised values.

⇒ The precise measurement is one that has the least absolute uncertainty. 

⇒ The precise measurement depends upon the instrument used in the measurement. 

⇒ The instrument with the smaller least count has greater precision and accuracy in the merriment. 


Accuracy: In a measurement, accuracy means how much the observable value is close to the actual value. 

Example: The actual value of the length of the table is 14 cm. Observers A, B, and C measured the length of the table which is 12.08 cm, 13.05 cm, and 14.50 cm respectively, which is close to the actual value.

⇒ An accurate value is one that has less fractional or percentage uncertainty.

⇒ Accuracy of measurement depends upon the number of significant figures. Greater SF will give us a more accurate value.


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1. Website for School and College Level Physics   
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3. Website for Single National Curriculum Pakistan - All Subjects Notes 

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