Review from Yesterday

• 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 3Measurement

• 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

• What? pounds, Newton's, zebras

• MUST include UNITS to make it more understandable.

• 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 Milli1000x 100x 10x 0 0.1x 0.01x 0.001xKids Have Dropped Over Dead Converting Metrics

Meter orLiter orGram

Measuring Quantities in SIBase Units

• 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

• 25 L = __________ mL

• 20 mg = _________cg

• 120 m = ___________km

• 567 cm = __________mm

• 45 kL =___________L

• 0.003 km = ________ cm

Homework

• Metrics Worksheet