units of measurement. i.units of measurement a.what measurement system is used in all disciplines of...
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Units OfMeasurement
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I. Units of Measurement
A. What measurement system is used in all disciplines of science?
1. WHY?
B. Base Units
Quantity Unit AbbreviationLength Meter m
Mass Kilogram kg
Time Second s
Temperature Kelvin K
Electric Current Ampere A
Amount of Substance Mole mol
Luminous Intensity Candela cd
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C. Metric System prefixes:
Prefix Symbol Meaning Multiple
kilo k thousand 1000
hecto h hundred 100
deka da ten 10
Prefix Symbol Meaning Multiple
deci d tenth 0.1
centi c hundredth 0.01
milli m thousandth 0.001
GreaterThanOne
SmallerThanOne
In between: meter - lengthgram - massliter - volume
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Use the following for metric conversions:
In between: meter - lengthgram - massliter - volume
1 giga = 1,000,000,0001 mega= 1,000,000
1 kilo = 10001 hecto = 1001 deca = 10
10 deci = 1100 centi = 11000 milli = 1
1,000,000 micro (µ) = 11,000,000,000 nano (n) = 1
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D. Accuracy and Precision
2. Precision – How accurately something is measured.
1. Accuracy – How close a measurement is to the actual value.
AccuracyAnd
Precision
Good AccuracyGood Precision
Poor AccuracyPoor Precision
Poor AccuracyGood Precision
Good AccuracyPoor Precision
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E. Scientific Notation
1. A way to express very large or very small numbers
265,000 2.65 x 105
2. HOW
a. 1. Find the decimal
b. Count
Positive (Number is greater than one.)
Negative (Number is less than one.)
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1. 1,800,000,000
2. 200,000
3. 154,000,000
4. 0.023
5. 0.000000432
6. 0.05
7. 134,555,000
8. 0.13
9. 234,000.0
10. 930,000,000
11. 111,000
12. 0.0009
13. 444,000,000
14. 0.000000025
1. 1.8 X 109
2. 2.0 X 105
3. 1.54 X 108
4. 2.3 X 10-2
5. 4.32 X 10-7
6. 5.0 X 10-2
7. 1.34 X 108
8. 1.3 X 10-1
9. 2.34 X 105
10. 9.30 X 108
11. 1.11 X 105
12. 9.0 X 10-4
13. 4.44 X 108
14. 2.5 X 10-8
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How to make metric measurements
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1cm 32 54
2 cm
Measure using centimeters.
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1cm 32 54
2.5 cm
Measure using centimeters.
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1cm 32 54
3.2 cm
Measure using centimeters.
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1cm 32 54
0.5 cm
Measure using centimeters.
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1cm 32 54
51 mm
Measure using millimeters.
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1cm 32 54
25 mm
Measure using millimeters.