Measuring ze What is Systeme Internationale dUnites (or International System of Units) Abbreviated SI (System of International Measures) It is the internationally

Measuring

ze

What is

Systeme Internationale d’Unites

(or International System of Units)

Abbreviated SI(System of International Measures)

It is the internationally accepted standard units of measure.

Formerly known as…

The Metric System

The SI Base Units are…

What it measures Base UnitLength Meter (m)

Mass Kilogram (kg)

Volume Liter (l or L or ℓ)

Time Seconds (s)

Temperature Kelvin (K)

Amount of a substance Mole (mol)

Electric Current Ampere (A)

Luminous Intensity Candela (cd)

Basic units of the SI system:

Length = meters (m)

Mass = gram (g)

Volume = liter (L or l)

The SI System

“I’m ten times better than the way you measure now!”

Let’s see why…

Fill in the blanks (do the math mentally):13 miles = ____yards

____feet ____inches

2 1/2 gallons = ____quarts ____pints ____cups ____ounces

(22,880 yds) (68,640 ft.)(823,680 in)

(10)(20 p)(40 cups)(320 ounces)

That was not the SI system!

What number is the SI system based on?

Let’s see why 10 is an easy base to use.

Multiply each of the following numbers by 10

15 x 10 =

235 x 10 =

12.4 x 10 =

43.2 x 10 =

853.56 x 10 =


15 x 10 = 150

235 x 10 =

12.4 x 10 =

43.2 x 10 =

853.56 x 10 =


15 x 10 = 150

235 x 10 = 2350

12.4 x 10 =

43.2 x 10 =

853.56 x 10 =


15 x 10 = 150

235 x 10 = 2350

12.4 x 10 = 124

43.2 x 10 =

853.56 x 10 =


15 x 10 = 150

235 x 10 = 2350

12.4 x 10 = 124

43.2 x 10 = 432

853.56 x 10 =


15 x 10 = 150

235 x 10 = 2350

12.4 x 10 = 124

43.2 x 10 = 432

853.56 x 10 = 8535.6


15 x 100 =

235 x 100 =

12.4 x 100 =

43.2 x 100 =

853.56 x 100 =


15 x 100 = 1500

235 x 100 =

12.4 x 100 =

43.2 x 100 =

853.56 x 100 =


15 x 100 = 1500

235 x 100 = 23500

12.4 x 100 =

43.2 x 100 =

853.56 x 100 =


15 x 100 = 1500

235 x 100 = 23500

12.4 x 100 = 1240

43.2 x 100 =

853.56 x 100 =


15 x 100 = 1500

235 x 100 = 23500

12.4 x 100 = 1240

43.2 x 100 = 4320

853.56 x 100 =


15 x 100 = 1500

235 x 100 = 23500

12.4 x 100 = 1240

43.2 x 100 = 4320

853.56 x 100 = 85356

Divide each of the following numbers by 10

230 10 =

4500 10 =

123.5 10 =

21.6 10 =

8.465 10 =


230 10 = 23

4500 10 =

123.5 10 =

21.6 10 =

8.465 10 =


230 10 = 23

4500 10 = 450

123.5 10 =

21.6 10 =

8.465 10 =


230 10 = 23

4500 10 = 450

123.5 10 = 12.35

21.6 10 =

8.465 10 =


230 10 = 23

4500 10 = 450

123.5 10 = 12.35

21.6 10 = 2.16

8.465 10 =


230 10 = 23

4500 10 = 450

123.5 10 = 12.35

21.6 10 = 2.16

8.465 10 = .8465


230 100 =

4500 100 =

123.5 100 =

21.6 100 =

8.465 100 =


230 100 = 2.30

4500 100 =

123.5 100 =

21.6 100 =

8.465 100 =


230 100 = 2.30

4500 100 = 45.00

123.5 100 =

21.6 100 =

8.465 100 =


230 100 = 2.30

4500 100 = 45.00

123.5 100 = 1.235

21.6 100 =

8.465 100 =


230 100 = 2.30

4500 100 = 45.00

123.5 100 = 1.235

21.6 100 = .216

8.465 100 =


230 100 = 2.30

4500 100 = 45.00

123.5 100 = 1.235

21.6 100 = .216

8.465 100 = .08465

Nice Job! If you can multiply & divide by 10 (or any power of 10), then the metric system will be easy for you.

Checkpoint: Metric units are based on multiples of what

number?

• Metric units are based on multiples of

10

• Multiply--Move the decimal to the right• Divide--Move the decimal to the left

Scientists created different sized units of measure by adding prefixes to the base units.

It’s kind of like using a cup as a basic measure and using 1/2 a cup, 1/4 of a cup, or 1/3 of a cup for the smaller measures.

Prefix Symbol Numerical value in Base units

Power of 10 value

Giga G 1,000,000,000 109

Mega M 1,000,000 106

Kilo- k 1000 103

Hecto- h 100 102

Deka- da 10 101

Base Unit -- 1 100

Deci- D 0.1 10-1

Centi- c 0.01 10-2

Milli- m 0.001 10-3

Nano n 0.000000001 10-9

Pico P 0.000000000001 10-12

The

SI

Pre

fixe

s

What is length?

• Length is the distance from one point to another

The basic unit of length in the SI system is the …

meter

Pause…

How big do you think a meter is?

Find something you think is a meter in length.

THE METER

The meter is the starting point for measuring length in the metric system.

START

Here’s a meter stick!

It takes 10 decimeters to make up 1 meter.

It takes 10 centimeters to make up 1 decimeter.

If 1 meter = 10 decimeters

and

1 decimeter = 10 centimeters,

then how many centimeters make up 1 meter?

That’s right!1 meter = 100 centimeters

100centimeters = 1 meter

It takes 10 millimeters to make up 1 centimeter.

Boy, that’s small!

If 1 meter = 10 decimetersand

1 decimeter = 10 centimetersand

1centimeter = 10 millimeters

then how many millimeters make up 1 meter?

That’s right!1000 millimeters = 1 meter

It takes 10 millimeters to make up 1 centimeter.

Millimeters are so small that they almost run together.

Checkpoint One centimeter is divided into how many millimeters?

• 10 millimeters (mm)

Now let’s take a closer look at some measuring devices.

This is a magnified image of a ruler/meter stick.

1

This is one centimeter.

2 3 4


1

This is half of a centimeter.

2 3 4


1

This is one millimeter.

2 3 4

1 2 3 4

This key measures 3 cm.

1 2 3 4

Or you could say that it measures 30 mm.

1 2 3 4

This key measures 2.5 cm.

1 2 3 4

Or, you could say that it measures 25 mm.

1 2 3 4

This toy car measures 4.2 cm.

1 2 3 4

Or, you could say it measures 42 mm.

The metric system deals with powers of 10

1 meter =

10 decimeters =

100 centimeters =

1000 millimeters

How many centimeters make up 2 meters?

That’s right! There are 200 centimeters in 2

meters.

How many millimeters make up 2 meters?

That’s right! There are 2000 millimeters in 2

meters.

How many decimeters make up 2 meters?

That’s right! There are 20 decimeters in 2

meters.

The metric system really is 10 times better than our

standard system of measurement. It is very easy to convert from one

unit to another.

You must simply multiply by 10, 100, or

1000.

OR

You must simply divide by 10, 100, or 1000.

The end.

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Measuring ze What is Systeme Internationale dUnites (or International System of Units) Abbreviated SI (System of International Measures) It is the internationally