Transcript Metric System - Jackson County School District

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Measurements
The Metric system was developed in France
during the Napoleonic reign of France in the
1790's.
“Weights and measures may be
ranked among the necessaries of
life to every individual of human
society…They are necessary to
every occupation of human
industry.... The knowledge of
them, as in established use, is
among the first elements of
education...”
JOHN QUINCY ADAMS - Report to the Congress, 1821
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Which other countries, besides the
U.S., do not use the metric system?
• Only a few small countries (Liberia and
Myanmar) , including some Caribbean
nations heavily influenced by the U.S.,
have not formally adopted the use of SI.
• Among countries not claiming to be
metric, the U.S. is the only significant
holdout.
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• In any measurement system,It…
1. must be agreed upon and
2. cannot change
Ex: The foot.
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Le Systeme Internationale d’Unites (SI)
•1960- SI system
•Based on Metric System
Standards
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• In a measurement system there are
exact quantities that people agree
to use for a certain measurement.
– Ex: The meter
• The speed that light travels in a
vacuum 1/299 792 458 of a second.
• Why...This seems CRAZY!!!
• The meter Clip
Another Example of a Standard
…..The kilogram
The official
kilogram, made of
platinum-iridium,
remains in France
at the
International
Bureau of Weights
and Measures
Clip
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Le Systeme Internationale
d’Unites (SI)
•English: International
System of Units
•Each measurement
has a base unit.
SI System
•
•
•
•
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Based on multiples of ten.
Examples of base units
Length
•Temperature
– Meter
-Kelvin
Mass
•Energy
– Gram
-Joule
•Electric Current
Volume
-Ampere
– Liter
Time
– Second
Base Units
•
•
•
•
EX:
1 Liter= 1000ml
1 gram = 1000mg
1meter= 1000mm
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Prefixes
10
• Prefixes are used with the base units to indicate
what multiple or fraction of ten should be used.
Multiple of BU
King Henry
Died
Drinking Choc. Milk
Kilo-
Hecto- Deca-
k
h
D
1000x
100x
10x
Based on
Multiples
of TEN
BU
BASE
UNIT
•Meter
•Liter
•Gram
•Watt
•Newton
•Second
•Joule
Fraction of BU
Deci-
Centi-
d
c
0.1
0.01
Millim
0.001
Metric Conversions
• A conversion is changing
the way you state the same
amount!
• Ex: 1 dollar
– 4 quarters, 100 pennies, 10
dimes
• 1meter = 100centimeters
• Simply move your decimal
point.
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Distance
Meter Stick
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•1m = 100 Centimeters
•1m = 1000 millimeters
Each line on the meter stick is a millimeter.
1cm = 10 mm
Meter Stick
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The last digit in all measurements
is an estimate digit.
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Amount of matter in an object
300 +70 +3.31
=373.32g
Triple Beam Balance
Grams
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Space occupied by an Object
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Length x Height x Width =Volume
Graduated Cylinder
Volume
•Space an object occupies
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2612
Kinetic Energy
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Absolute Temperature
Temperature
scale
Fahrenheit vs. Celsius vs. Kelvin
1714:Daniel Gabriel
Fahrenheit (16861736)
Superfridge
1742, Anders
Celsius (1701-1744)
Lord Kelvin
(1824-1907)
Absolute Zero: temperature
at which all matter stops
moving.
Video Clip
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Practice: Temperature Conversion:
1) 250 Kelvin to ºCelsius
2) 339 Kelvin to ºCelsius
3) 17º Celsius to Fahrenheit
4) 55º Celsius to Fahrenheit
5) 89.5º Fahrenheit to Celsius
6) 383º Kelvin to Fahrenheit
Temperature Conversion
Answers
1) -23 ºC
2) 66 ºC
3)
4)
5) 31.9 ºC
6) 230 ºF
1.
2.
3.
4.
5.
6.
7.
Starter:
How many ml are in 1 kl?
If I have 3475.8 L, how many ml do I have?
What is a standard?
What are some units for volume? (give 2)
What is an independent variable?
What is mass?
Marsha has three 2-L sodas. How many ml
does she have total? If there are six people
at dinner, how many ml can they each have
(and it be equal amounts)??
29.1
Mass per unit Volume
Density
• Density: Amount of
matter in a specific
volume.
29.2
These 2 cubes have
the same VOLUME,
but they have
different densities.
Why?
Density practice problem
• Which cylinder
has the greatest
density?
• So, if I had the same
amount of each
cylinder (1 ml), which
one would have a
greater mass??
Vol: 5 ml
Mass: 10g
Density = 2 g/ml
Vol: 25 ml
Mass: 15 ml
Density = 1.7 g/ml
Derived Units
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Obtained by combining different units.
Ex: Density
Density is the amount of mass per unit volume.
D = m/v
TYPES OF DATA
Quantitative vs. Qualitative
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• If the data collected involve observations without
measurements or numbers, then it is referred to as
qualitative data.
• Quantitative data involves numbers or
measurements.