Warm-upWarm-up Tues. 2/6/07Tues. 2/6/071. a.) __________measure volume

b.) __________measure distancec.) __________measure mass

*Liters (L) *Meters (m) *Grams (g)

2. Which is larger?a.) 1 Milliliter (mL) or 1 Liter (L)?b.) 1 Meter (m) or 1 Centimeter (cm)?c.) 1 Gram (g) or 1 Kilogram (kg)?

3. How many meters (m) are in 1 Kilometer (km)?

4. How many centimeters (cm) are in 1 kilometer (km)?

Warm-up answers:1. a.) Liters (L) measure volume

b.) Meters (m) measure lengthc.) Grams (g) measure mass

2. a.) 1 L > 1mLb.) 1 m > 1 cmc.) 1 Kg > 1 g

3. There are 1,000 m in 1 km1,000 m = 1 km

4. There are 100,000 cm in 1 km100,000 cm = 1 km

Scientific Method

• 5 Steps

1. Ask a question

2. Form a hypothesis (Make a guess)

3. Design an experiment

4. Collect and Analyze data

5. Make a conclusion

The Metric System of Measurement

• In Science, we must make precise measurements before our observations can be analyzed.

• What kinds of measurements do we make?– Length (m)– Volume (L), (m3)– Mass (g)

Many OTHERS…

weight, temperature, electrical current, force…

English Vs. Metric

• For everyday measurements, most Americans use ENGLISH UNITSENGLISH UNITS– Inches, miles, quarts, pounds

• For all science work we use METRIC UNITSMETRIC UNITS– meters (m), Liters (L), grams (g)– Also known as: “S.I. SYSTEM”“S.I. SYSTEM”

• Why?Why?– So that everyone is describing objects and So that everyone is describing objects and

propertiesproperties of objects in the same of objects in the same LanguageLanguage

We are NOT going to use the English System in this Science class!

It is necessary to have a common language of It is necessary to have a common language of measurement so that we can understand what other measurement so that we can understand what other

scientists are talking about.scientists are talking about.

Metric System

• Made-up of UNITSUNITS and PREFIXESPREFIXES

• UNITS: measurements that do not changeUNITS: measurements that do not change– meters (m)– Liters (L)– Grams (g)

• PREFIX: a beginning that you add to a word to PREFIX: a beginning that you add to a word to change its meaningchange its meaning– Example: Pre-game, what happens on ESPN before Example: Pre-game, what happens on ESPN before

the gamethe game– Example: Superman, he’s more than just an ordinary Example: Superman, he’s more than just an ordinary

manman

Common Metric Units of Measurement

• Length is measured in ___________

• Volume is measured in ___________

• Mass is measured in _____________

Meters (m)

Liters (L)

Grams (g)

Common Metric Pre-Fixes

• Kilo -

• Centi -

• Milli -

1000

1/100

.01

1/1000

0.001

Metric System

• Based on Powers of 10Based on Powers of 10

• This allows us to easily change easily change between units.between units.

• $ Like Money $

Making Conversions

Basic Unit

Kilo-Hecto-

Deca-

Deci-

Centi-

Milli-

1000 units 100

units 10 units

0.1 units 0.01

units 0.001 units

To convert to a smaller unit, move decimal point to the right, or multiply

To convert to a larger unit, move decimal point to the left, or divide

x10

x100

x1000÷10

÷100÷1000

m, L, gm, L, g

Practicing Metrics Conversions

• Let’s practice a few on the board

• Then we’re going to do the metrics lab

Warm-down

• 5 steps of scientific method:1. Question

2. Hypothesis

3. Experiment

4. Collect & analyze data

5. Conclusion

Warm-down:

• Which system of Measurement do we use in ALL SCIENCE?

– Metric System

Common Metric Units of Measurement

• Length is measured in ___________

• Volume is measured in ___________

• Mass is measured in _____________

Meters (m)

Liters (L)

Grams (g)

Metric system is based on…

The metric system is based on powers of 10powers of 10