SI measurementSI measurement

• Le Système international d'unitésLe Système international d'unités • The only countries that have not officially The only countries that have not officially

adopted SI are Liberia (in western Africa) adopted SI are Liberia (in western Africa) and Myanmar (a.k.a. Burma, in SE Asia), and Myanmar (a.k.a. Burma, in SE Asia), but now these are reportedly using metric but now these are reportedly using metric regularlyregularly

• Metrication is a process that does not Metrication is a process that does not happen all at once, but is rather a process happen all at once, but is rather a process that happens over time. that happens over time.

• Among countries with non-metric usage, Among countries with non-metric usage, the U.S. is the only country significantly the U.S. is the only country significantly holding out.holding out. The U.S. officially adopted SI The U.S. officially adopted SI in 1866.in 1866.

Information from U.S. Metric Association

Standards of Standards of MeasurementMeasurement

When we measure, we use a measuring When we measure, we use a measuring tool to compare some dimension of an tool to compare some dimension of an object to a standard.object to a standard.

For example, at one time For example, at one time the standard for length was the standard for length was

the king’s foot. What are the king’s foot. What are some problems with this some problems with this

standard?standard?

Stating a MeasurementStating a Measurement

In every measurement there is aIn every measurement there is a

Number Number followed by a followed by a

Unit Unit from a measuring devicefrom a measuring device

The number should also be as precise as the measurement!The number should also be as precise as the measurement!

Mass vs. WeightMass vs. Weight

• Mass: Amount of Mass: Amount of Matter (grams, Matter (grams, measured with a measured with a BALANCE)BALANCE)

• Weight: Force Weight: Force exerted by the mass, exerted by the mass, only present with only present with gravity (pounds, gravity (pounds, with a SCALE)with a SCALE)

• measuredmeasured

Can you hear Can you hear me now?me now?

Some Tools for Some Tools for MeasurementMeasurement

Which tool(s) Which tool(s) would you use to would you use to measure:measure:

A.A. temperature temperature

B.B. volume volume

C.C. time time

D.D. weight weight

Learning Check

Match Match L) lengthL) length M) mass M) mass V) volume V) volume

____ A. A bag of tomatoes is 4.6 kg.____ A. A bag of tomatoes is 4.6 kg.

____ B. A person is 2.0 m tall.____ B. A person is 2.0 m tall.

____ C. A medication contains 0.50 g Aspirin.____ C. A medication contains 0.50 g Aspirin.

____ D. A bottle contains 1.5 L of water.____ D. A bottle contains 1.5 L of water.

M

L

M

V

Learning CheckLearning Check

What are some U.S. units that are used to What are some U.S. units that are used to measure each of the following?measure each of the following?

A. length A. length

B. volume B. volume

C. weightC. weight

D. temperatureD. temperature

SolutionSolution

Some possible answers areSome possible answers are

A.A. length length inch, foot, yard, mile inch, foot, yard, mile

B.B. volumevolume cup, teaspoon, gallon, pint, quartcup, teaspoon, gallon, pint, quart

C.C. weight weight ounce, pound (lb), tonounce, pound (lb), ton

D.D. temperature temperature FF

Metric Metric PrefixesPrefixes

• Kilo-Kilo- means 1000 of that unit means 1000 of that unit

– 1 kilometer (km) = 1000 meters (m)1 kilometer (km) = 1000 meters (m)

• Centi-Centi- means 1/100 of that unit means 1/100 of that unit

– 1 meter (m) = 100 centimeters (cm)1 meter (m) = 100 centimeters (cm)

– 1 dollar = 100 cents1 dollar = 100 cents

• Milli-Milli- means 1/1000 of that unit means 1/1000 of that unit

– 1 Liter (L) = 1000 milliliters (mL)1 Liter (L) = 1000 milliliters (mL)

Metric Metric PrefixesPrefixes

Metric Metric PrefixesPrefixes

Units of Units of LengthLength

• ? kilometer (km) = 500 meters (m)? kilometer (km) = 500 meters (m)

• 2.5 meter (m) = ? centimeters (cm)2.5 meter (m) = ? centimeters (cm)

• 1 centimeter (cm) = ? millimeter (mm)1 centimeter (cm) = ? millimeter (mm)

• 1 nanometer (nm) = 1.0 x 101 nanometer (nm) = 1.0 x 10-9-9 meter meter

Learning Check

Select the unit you would use to measure Select the unit you would use to measure

1. Your height1. Your height

a) millimeters a) millimeters b) metersb) meters c) kilometers c) kilometers

2. Your mass2. Your mass

a) milligramsa) milligrams b) gramsb) grams c) kilograms c) kilograms

3. The distance between two cities3. The distance between two cities

a) millimetersa) millimeters b) metersb) meters c) kilometers c) kilometers

4. The width of an artery4. The width of an artery

a) millimetersa) millimeters b) metersb) meters c) kilometers c) kilometers

Solution

1. Your height1. Your height

b) metersb) meters

2. Your mass2. Your mass

c) kilogramsc) kilograms

3. The distance between two cities3. The distance between two cities

c) kilometersc) kilometers

4. The width of an artery4. The width of an artery

a) millimetersa) millimeters

Equalities

State the same measurement in two State the same measurement in two different unitsdifferent units

lengthlength

10.0 in.10.0 in.

25.4 cm25.4 cm

1. 1000 m = 1 1. 1000 m = 1 ______ a) mm b) km c) dma) mm b) km c) dm

2. 0.001 g = 1 2. 0.001 g = 1 ___ ___ a) mg b) kg c) dga) mg b) kg c) dg

3. 0.1 L = 1 3. 0.1 L = 1 ______ a) mL b) cL c) dLa) mL b) cL c) dL

4. 0.01 m = 1 ___ 4. 0.01 m = 1 ___ a) mm b) cm c) dma) mm b) cm c) dm

Learning Check

English and Metric English and Metric ConversionsConversions

• If you know ONE conversion for each type of If you know ONE conversion for each type of measurement, you can convert anything!measurement, you can convert anything!

• You must You must memorizememorize and use these conversions: and use these conversions:– Mass: 454 grams = 1 poundMass: 454 grams = 1 pound– Length: 2.54 cm = 1 inchLength: 2.54 cm = 1 inch– Volume: 0.946 L = 1 quartVolume: 0.946 L = 1 quart

Mass vs. WeightMass vs. Weight

• Mass: Amount of Mass: Amount of Matter (grams, Matter (grams, measured with a measured with a BALANCE)BALANCE)

• Weight: Force Weight: Force exerted by the mass, exerted by the mass, only present with only present with gravity (pounds, gravity (pounds, measured with a measured with a SCALE)SCALE)

Can you hear Can you hear me now?me now?

Some Tools for Some Tools for MeasurementMeasurement

Which tool(s) Which tool(s) would you use to would you use to measure:measure:

A.A. temperature temperature

B.B. volume volume

C.C. time time

D.D. weight weight

Learning Check

Match Match L) lengthL) length M) mass M) mass V) volume V) volume

____ A. A bag of tomatoes is 4.6 kg.____ A. A bag of tomatoes is 4.6 kg.

____ B. A person is 2.0 m tall.____ B. A person is 2.0 m tall.

____ C. A medication contains 0.50 g Aspirin.____ C. A medication contains 0.50 g Aspirin.

____ D. A bottle contains 1.5 L of water.____ D. A bottle contains 1.5 L of water.

M

L

M

V

Learning CheckLearning Check

What are some U.S. units that are used to What are some U.S. units that are used to measure each of the following?measure each of the following?

A. length A. length

B. volume B. volume

C. weightC. weight

D. temperatureD. temperature

SolutionSolution

Some possible answers areSome possible answers are

A.A. length length inch, foot, yard, mile inch, foot, yard, mile

B.B. volumevolume cup, teaspoon, gallon, pint, quartcup, teaspoon, gallon, pint, quart

C.C. weight weight ounce, pound (lb), tonounce, pound (lb), ton

D.D. temperature temperature °F°F