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Measurement

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by

Ann Gardner

on 24 February 2014

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Transcript of Measurement

Measurement
What is it?
a physical quantity
requires a unit to give it meaning
based on standards of measurement (i.e., Metric, English systems)
subject to experimental error
Units & Derived Units
SI Units & Prefixes
Length, mass, time, temperature, etc.
Tables 1.1, 1.2
Convert between different units (i.e., Kelvin & Celsius, millimeter to meter, & so on)
Derived Units
Units not
directly
measured
The unit must be
calculated

density, volume, pressure (Table 1.3)
Accuracy & Precision
Measurement is
uncertain
Accuracy = the
true
value
Precision = the closeness, reproducibility of a set of measurements
Significant Digits
The number of reliable digits in a measurement or calculation
Defined by 1/10th the finest unit
The last digit is always an estimate
Determined by the Atlantic-Pacific Rule
Calculations with
Significant Digits
Addition & Subtraction
Use the
same number of decimal places
in the answer as there are in the measurement with the
least number of decimal places
Precision is more than 'consistency'
2.0 is more precise than 2
Precision is based on the
number
of
significant digits
Measuring the 1/10th
43mL can be measured, but the fluid is between 43 & 44 mL
The 'in between' is the estimate
The units are 1mL
The estimate is based on tenths (1/10th), so, it's about 0.2
The measurement is 43.2 mL
If a decimal is
a
bsent
, count from the
A
tlantic
side with the first non-zero number & all numbers after
If a decimal is
p
resent
, count from the
P
acific
side with the first non-zero number & all numbers after
Another way to write it:
If a decimal point is
Present
,
ignore

zeros
on the
Pacific
(left) side. If the decimal point is
Absent
,
ignore zeros
on the
Atlantic
(right) side. Everything else is significant.
Multiplication & Division
Use the
same number of significant digits
as the measurement with the
least number of significant digits
Sources
https://www.diigo.com/list/virtualgardner/Measurement+Prezi/31vqgdzf4
Full transcript