units of measurement. i.units of measurement a.what measurement system is used in all disciplines of...
TRANSCRIPT
Units OfMeasurement
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
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
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
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
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.)
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
How to make metric measurements
1cm 32 54
2 cm
Measure using centimeters.
1cm 32 54
2.5 cm
Measure using centimeters.
1cm 32 54
3.2 cm
Measure using centimeters.
1cm 32 54
0.5 cm
Measure using centimeters.
1cm 32 54
51 mm
Measure using millimeters.
1cm 32 54
25 mm
Measure using millimeters.