# Significant Digits by 4k75yts4

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```									Significant Digits

What are they?
And
How do you use them?
Accuracy:

 This is the concept which deals with whether a
measurement is correct when compared to the known
value or standard for that particular measurement.
involves a statement about percent error.
 Percent error is often expressed by the following
equation:
 % error = (|experiment value - accepted value| /
accepted value) x 100%
 Also see Problem Set # 1-14 in the workbook
Precision:

 This is the concept which addresses the degree of
exactness when expressing a particular measurement.
 The precision of any single measurement that is made
by an observer is limited by how precise the tool
(measuring instrument) is in terms of its smallest unit.
 How would you divide the following 1 meter long bar up
into smaller divisions? Why? What would your choice
have to do with precision?

1 METER BAR
Precision and Measuring:
Significant Digits:
When someone else has made a
measurement, you have no control over
the choice of the measuring tool or the
degree of precision associated with the
device used.
You must rely on a set of rules to tell you
the degree of precision.
Refer to the “Rules for determining when
zeros are significant” (PS#1-9, workbook)
Significant Digits in Math:

Use PS#1-10 to check your understanding
of identifying significant digits in
measurements.
See PS#1-11 for the rules about using