Difference between revisions of "Precise"

Revision as of 11:56, 22 March 2019

Results are precise if they given to a large number of significant figures.

Results may be said to be precise if each repeated results is close to the same value.

The smaller the uncertainty the greater the precision.

Precision is achieved by:

Using instruments with a high resolution.
Controlling variables so that readings are stable over a long period of time. Sometimes readings fluctuate so they cannot be recorded to as many significant figures as the instrument shows.

The number pi is 3.14159265359 correct to 12 significant figures.

3.1 is an accurate value for pi but it is not very precise - Close to the real number, but not many significant figures.

3.2111 is a precise value for pi but it is inaccurate - Not close enough to the real number, but has several significant figures.

@@ Line 4: / Line 4: @@
 ===About Precision===
-: '''Precision''' is achieved by
+: [[Results]] may be said to be '''precise''' if each [[repeat]]ed [[result]]s is close to the same [[value]].
+: The smaller the [[uncertainty]] the greater the '''precision'''.
+: '''Precision''' is achieved by:
 :*Using [[Measuring Instrument|instrument]]s with a high [[resolution]].
 :*[[Control Variable|Controlling]] [[variable]]s so that [[reading]]s are stable over a long period of [[time]]. Sometimes [[reading]]s fluctuate so they cannot be recorded to as many [[Significant Figures|significant figures]] as the [[Measuring Instrument|instrument]] shows.