Review from Yesterday
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What is the Scientific Method?
What are the steps of the scientific method?
Define hypothesis.
Why do scientists communicate their
results?
• Do you perform a method of solving
problems?
Section 3
Measurement
• Key Concepts
• Why is scientific notation useful?
• What units do scientists use for their
measurements?
• How does the precision of measurements affect
the precision of scientific calculations?
• The Metric System
Measurements
• The oldest known record of measurements
is about 10,000 yrs. old (found in Africa)
• Because not many humans were able to
measure, they all used the same system.
• When everyone agrees to the same units it
is called Standard Units
The International System of
Units (SI system)
• Developed in France in 1799
• has units for all types of quantities
• unit is written after the number
The International System of
Units (SI system)
• Weight = 125
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What? pounds, Newton's, zebras
• MUST include UNITS to make it more
understandable.
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125 pounds
The International System of
Units (SI system)
• SI system works by combining prefixes and
base units.
• Each base unit can be used with different
prefixes to define larger or smaller
quantities.
The International System of
Units (SI system)
Prefixes
Kilo Hecto Deca Base unit Deci Centi Milli
1000x 100x 10x
0
0.1x 0.01x 0.001x
Kids Have Dropped Over Dead Converting Metrics
Meter
or
Liter
or
Gram
Measuring Quantities in SI
Base Units
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Length
Volume
Mass
Temperature
Length
• Length (distances) are measured in
Meters (m)
• Meter stick is equal to 1 meter
• Units are created by attaching prefixes
• 1 Kilometer, 1 millimeter, 1 centimeter
1000 m
.001m
.01m
Volume
• Is how much space an object takes up
• Measured in Liters (L)
• 2 ways to find volume
Mathematical – Length x Width x Height
Displacement – Demonstrate using
graduated cylinder
• KL, mL, L
Mass
• Is the measure of the amount of matter in an
object
• Measured in Grams (g)
• Mass is NOT WEIGHT
• Use a balance to find mass
Temperature
• degrees Celsius (oC) is used to measure
temperature
• A thermometer is used
• Water freezes at 0 oC and boils at 100 oC
• There is no prefix used for temperature
How do you convert in the
Metric System?
• How many millimeters are there in 2.5
Kilometers?
1st – set up the prefixes
Kilo Hecto Deca O Deci Centi Milli
How do you convert in the
Metric System?
• 2nd – set up what you have to convert
Kilometers to millimeters
• 3rd – Look at your prefixes again
Kilo Hecto Deca O Deci Centi Milli
How do you convert in the
Metric System?
• 4th – count how many spaces separate the
two prefixes
Kilo Hecto Deca O Deci Centi Milli
How do you convert in the
Metric System?
• 4th – count how many spaces separate the
two prefixes
Kilo Hecto Deca O Deci Centi Milli
1
How do you convert in the
Metric System?
• 4th – count how many spaces separate the
two prefixes
Kilo Hecto Deca O Deci Centi Milli
2
How do you convert in the
Metric System?
• 4th – count how many spaces separate the
two prefixes
Kilo Hecto Deca O Deci Centi Milli
3
How do you convert in the
Metric System?
• 4th – count how many spaces separate the
two prefixes
Kilo Hecto Deca O Deci Centi Milli
4
How do you convert in the
Metric System?
• 4th – count how many spaces separate the
two prefixes
Kilo Hecto Deca O Deci Centi Milli
5
How do you convert in the
Metric System?
• 4th – count how many spaces separate the
two prefixes
Kilo Hecto Deca O Deci Centi Milli
6
How do you convert in the
Metric System?
• 5th – move the decimal the same amount of
spaces in the same direction you moved
Kilo Hecto Deca O Deci Centi Milli
6 spaces

• 2.5 km
2.5
How do you convert in the
Metric System?
• 5th – move the decimal the same amount of
spaces in the same direction you moved
Kilo Hecto Deca O Deci Centi Milli
6 spaces

• 2.5 km
25.
How do you convert in the
Metric System?
• 5th – move the decimal the same amount of
spaces in the same direction you moved
Kilo Hecto Deca O Deci Centi Milli
6 spaces

• 2.5 km
250.
How do you convert in the
Metric System?
• 5th – move the decimal the same amount of
spaces in the same direction you moved
Kilo Hecto Deca O Deci Centi Milli
6 spaces

• 2.5 km
2500.
How do you convert in the
Metric System?
• 5th – move the decimal the same amount of
spaces in the same direction you moved
Kilo Hecto Deca O Deci Centi Milli
6 spaces

• 2.5 km
25000.
How do you convert in the
Metric System?
• 5th – move the decimal the same amount of
spaces in the same direction you moved
Kilo Hecto Deca O Deci Centi Milli
6 spaces

• 2.5 km
250000.
How do you convert in the
Metric System?
• 5th – move the decimal the same amount of
spaces in the same direction you moved
Kilo Hecto Deca O Deci Centi Milli
6 spaces

• 2.5 km
2500000.
How do you convert in the
Metric System?
• 5th – move the decimal the same amount of
spaces in the same direction you moved
Kilo Hecto Deca O Deci Centi Milli
6 spaces

• 2.5 km =
2500000. mm
2.5 km = 2,500,000 mm
How do you convert in the Metric
System?
• How many grams are there in 450
centigrams?
In-Class Work
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25 L = __________ mL
20 mg = _________cg
120 m = ___________km
567 cm = __________mm
45 kL =___________L
0.003 km = ________ cm
Homework
• Metrics Worksheet