MeasurementUnit 1 Mrs. Callender

Mete

r

Liter

Gram

LESSON ESSENTIAL QUESTIONCovering pp. 12 and 13 of your book.

WHAT IS A MEASUREMENT?

HOW DO I MEASURE AND WHAT UNITS DO I USE?

What is wrong with this measurement?

The Screw measures 5.1

What is wrong with this measurement?

The Screw measures 5.1 cm

Missing Units

To have a Measurement you must have two things:

QUANTITY -Something that has magnitude, size, or an amount.

UNIT –

A quantity adopted as a standard of measurement.

Measurement

What would be a measurement for this volume?

76.0 mL

MetrificationMost historians agree that Gabriel Mouton, the vicar of St. Paul's Church in Lyons, France, is the "founding father" of the metric system. He proposed a decimal system of measurement in 1670.

SI UNITS

•1960

•Système International

d’Unités or SI

•Built on seven base units.

Country Previous System of Measurement

Year of Conversion

Status of Metrification

France French 1795 Inventors

Cuba Spanish 1852 Complete

Germany German 1872 Complete

Switzerland Swiss 1876 Complete

India Various 1954 Complete

Japan Japanese 1957 Almost Complete

Great Britain Imperial/English 1965 Not Complete

Ireland Imperial/Old Irish 1967 Complete

Canada Canadian Imperial 1973 Not Complete

United States US - Not Official

Metric Around the World.

SI BASE UNITS

Quantity Symbol UnitAbbreviati

onLength l meter mMass m gram g

Volume v liter LTime t second sTemp. T kelvin K

Amount of substance

n mole mol

Metric System Prefixes

These prefixes are based on powers of 10. What does this mean?

From each prefix every “step” is either:10 times larger

or10 times smaller

For exampleCentimeters are 10 times larger than millimeters1 centimeter = 10 millimeters

kilo hecto deka

Base Units

metergramliter

deci centi milli

Metric System PrefixesFor each “step” to right,

you are multiplying by 10

For example, let’s go from a base unit to centi

1 liter = 10 deciliters = 100 centiliters

( 1 x 10 = 10) = (10 x 10 = 100)

2 grams = 20 decigrams = 200 centigrams (2 x 10 = 20) = (20 x 10 = 200)

kilo hecto deka

Base Units

metergramliter

deci centi milli

Metric System Prefixes

kilo hecto deka

Base Units

metergramliter

deci centi milli

If you move to the left in the diagram, move the decimal to the left.

If you move to the right in the diagram, move the decimal to the right.

Metric System Prefixes

kilo hecto deka

Base Units

metergramliter

deci centi milli

How many mg are in 4 Kg?

1 Kg = 106 mg therefore 4 Kg = 4 x 106 mg

How many g are in 4 Kg?

1 Kg = 103 g therefore 4 Kg = 4 x 103 g

Metric System Prefixes

kilo hecto deka

Base Units

metergramliter

deci centi milli

Without using a calculator, convert the following using “think pair share”:

1. 23.5 cg to dag 6. 10 hL to dL

2. 3 mL to hL 7. 27 m to dam

3. 4.25 x 105 KL to cL 8. 0.1 g to hg

4. 65 cg to Kg 9. 0.25 L to KL

5. 6.01 m to cm 10. 1000 cm to hm