measuring matter-a common language

Measuring Matter-A Common Language

A Standard Measurement

System

The International System of Units (SI)

The Metric

System

When and why was the metric system invented? • The metric system was invented

by a group of French scientists in 1790

• The metric system was invented because countries were using many different systems of measurement causing confusion and lack of consistency

WHY DO WE USE THE METRIC SYSTEM?

•Almost all other countries are using the metric system

•Other countries’ companies are refusing to buy products from the U.S. if not labeled in metric units

* Scientists need a universal way to communicate data (SI Units)

WHAT DOES THE METRIC SYSTEM

MEASURE?* The gram measures mass or how much something weighs

* The liter measures volume which is used when measuring liquids

* The meter measures the length of an object or the distance from place to place

Scientists all over the world use the International System of Units to measure:

• Length• Volume• Mass• Density• Temperature• Time

Metric System

A system of measurement used by the majority of countries on Earth based on the number 10

Key Concept: Why do scientists use a

standard measurement system?

• Using SI as the standard system of measurement allows scientists to compare data and communicate with each other about their results

• Using SI measurement also allows experiments to be repeated and most importantly achieve a desired result

DRAW THE FOLLOWING CHART ON THE BLANK SHEET OF WHITE PAPER IN THE REFERENCE PART OF YOUR FOLDER

THE METRIC CONVERSION CHART (STAIRCASE METHOD)

Kilo (k)1000units Hecto (h)

100units Deka (da)

10units Basic

UnitGram MeterLiter

Deci (d)0.1

units Centi (c)0.01units

Milli (m)0.001units

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

Length

Figure 1: Calculating - How much larger is a kilo- than a deka-?

• 100 times

What is length?

• Length is the distance from one point to another

What tool do we use to measure

length or distance?

A METER STICK is used to measure

lengths and distances

METER STICK

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

METER

APPROXIMATE CONVERSIONS BETWEEN METRIC & US LENGTH UNITS

• A meter is about the same length as a yard

• A meter is about three feet long• A decimeter is about four inches long• An inch is about 25 millimeters• A foot contains about 30 centimeters• A foot contains about 3 decimeters

THE METRIC CONVERSION CHART (STAIRCASE METHOD)

Kilo (k)1000units

Hecto (h)100

units Deka (da)10

units Basic Unit

Gram (g) Meter (m)

Liter (l)Deci (d)

0.1units

Centi (c)0.01units Milli (m)

0.001units

To convert to a smaller unit, movedecimal point to the right or

multiply.

To convert to a larger unit, move decimal point

to the left or divide

THERE ARE…• 1000 millimeters (mm) in a meter (m)• 100 centimeters (cm)in a meter (m)• 10 decimeters (d) in a meter (m)• 1 meter (m) in a meter (m)• 10 meters (m) equals 1 dekameters

(da)• 100 meters (m) equals 1 hectometer

(h)• 1000 meters (m) equals 1 kilometer (k)

MEASURING LENGTHS LONGER THAN A METER

EXAMPLE: The distance from point A to point B is 5.8m. What is that distance in KILOMETERS?

THE METRIC CONVERSION CHART (STAIRCASE METHOD)

Kilo1000units

Hecto100

units Deka10

units Basic UnitGram MeterLiter

Deci0.1

units Centi0.01units Milli

0.001units

Because KILOMETERS is larger than a meter, you move the decimal point 3 places to the left.

5.8m turns to .58da

1

THE METRIC CONVERSION CHART (STAIRCASE METHOD)

Kilo1000units

Hecto100

units Deka10

units Basic UnitGram MeterLiter

Deci0.1

units Centi0.01units Milli

0.001units

Because KILOMETERS is larger than a meter, you move the decimal point 3 places to the left.

5.8m turns to .058h

12

THE METRIC CONVERSION CHART (STAIRCASE METHOD)

Kilo1000units

Hecto100

units Deka10

units Basic UnitGram MeterLiter

Deci0.1

units Centi0.01units Milli

0.001units

Because KILOMETERS is larger than a meter, you move the decimal point 3 places to the left.

5.8m turns to .0058k

12

3

MEASURING LENGTHS LONGER THAN A METER

EXAMPLE: The distance from point A to point B is 50.35k (KILOMETERS). What is that distance in METERS?

THE METRIC CONVERSION CHART (STAIRCASE METHOD)

Kilo1000units

Hecto100

units Deka10

units Basic UnitGram MeterLiter

Deci0.1

units Centi0.01units Milli

0.001units

Because the METER is smaller than a KILOMETER, you move the decimal point 3 places to the right.

50.35k turns to 503.5h

1

THE METRIC CONVERSION CHART (STAIRCASE METHOD)

Kilo1000units

Hecto100

units Deka10

units Basic UnitGram MeterLiter

Deci0.1

units Centi0.01units Milli

0.001units

Because the METER is smaller than a KILOMETER, you move the decimal point 3 places to the right.

50.35k turns to 5035.da

1

2

THE METRIC CONVERSION CHART (STAIRCASE METHOD)

Kilo1000units

Hecto100

units Deka10

units Basic UnitGram MeterLiter

Deci0.1

units Centi0.01units Milli

0.001units

Because the METER is smaller than a KILOMETER, you move the decimal point 3 places to the right.

50.35k turns to 50350.m

1

2

3

MEASURING LENGTHS SMALLER

THAN A METER

The two units that measure the length of smaller objects are, …

• Decimeter• Centimeter• Millimeter

The longer lines on the metric ruler are called…

• centimeters

The shorter lines on the metric ruler are called…

• millimeters

One centimeter is divided into how many millimeters?

• 10 millimeters (mm)

Looking at the turtle below. Estimate it’s length from the rear of its shell to the tip of its nose. Record its length in

both centimeters and millimeters.

• 10.5 cm

• 105 mm

What is the length of the pencil below in centimeters AND millimeters?

5.8 cm 58 mm

RESULTS OF DESK MEASURES

LAB DESK A: 5.79 m, 579.0 cm, 5790 mm

LAB DESK B: 7.12 m, 712.0 cm, 7120 mm

LAB DESK C: 8.175 m, 817.5 cm, 8175 mm

LAB DESK HEIGHT: .93 m, 93 cm, 930 mm

VOLUME

Volume•The amount of space that matter occupies

•All matter has volume•Measurement of 3 dimensional objects

The basic unit of measure for

VOLUME is the LITER

COMMON UNITS OF VOLUME

•Liter (L)•Milliliter (mL)•Cubic Centimeter (cm³)

THE METRIC CONVERSION CHART (STAIRCASE METHOD)

Kilo (k)1000units

Hecto (h)100

units Deka (da)10

units Basic Unit

Gram (g) Meter (m)

Liter (l)Deci (d)

0.1units

Centi (c)0.01units Milli (m)

0.001units

To convert to a smaller unit, movedecimal point to the right or

multiply.

To convert to a larger unit, move decimal point

to the left or divide

How many milliliters are in 13

Liters?

THE METRIC CONVERSION CHART (STAIRCASE METHOD)

Kilo (k)1000units

Hecto (h)100

units Deka (da)10

units Basic Unit

Gram (g) Meter (m)

Liter (l)Deci (d)

0.1units

Centi (c)0.01units Milli (m)

0.001units

13.0 L

1

2

3

130. 0 d

1300.0 cL

13000.0 mL

13.0 L

TOOLS TO MEASURE VOLUME

• Metric ruler–Regular shaped objects

• Graduated Cylinder–Irregular shaped objects–liquids

EQUATING UNITS OF VOLUME

•1 L = 1,000 mL•1 mL = 0.001 L•1 mL = 1 cm³

CALCULATING VOLUME

•Using a metric rulerVolume = length X width X heightof an object

YOURPERSPECTIV

E

Length (l) Wid

th (w

)Hei

ght (

h)

METRIC SYSTEM24. Metric System Notes – Length25. Metric man26. Metric Woman27. Metric Spy28. Metric Shuttle29. 2 blank sheets of paper

a) Label Measurements in Meters (1)b) Label Graph in Meters (2)

30. VOLUME ACTIVITY31. 10 sheets of notebook paper

VOLUME ACTIVITY INSTRUCTIONS

• Number the paper 1 – 20• Measure each piece of

wood for its VOLUME in centimeters AND millimeters

TODAY IS: ThursdayOctober 30, 2008

• Are your backpacks in your lockers? They are not permitted.

• Did you use the restroom before this class? No passes will be issued.

• Did you bring all your materials to class? A requirement

• Is your folder available? A requirement

What tool is used to measure the VOLUME of irregular shaped

objects?

The GRADUATED CYLINDER

LIQUIDS AND IRREGULAR SHAPED OBJECTS ARE MEASURED IN LITERS

THERE ARE 1000 MILILITER IN A LITER

Graduated Cylinders come in a variety of sizes:

• 10 ml• 25 ml• 50 ml• 100 ml• 500 ml• 1000 ml

How do you read a

GRADUADTED CYLINDER?

Know the GRADUATES and the SUBGRADUATES

10

20GRADUATES

SUBGRADUATES

Note the MENISCUS

• The meniscus is the area where the fluid molecules are more attracted to the glass material than itself.

The measurement

is at the bottom of the

convex or meniscus.

You would read this as 18mL and not 18.5 mL. You would read this as 18mL and not 18.5 mL. You would read this as 18mL and not 18.5 mL.

Reading is 18 mL NOT 18.5 mL

Look at the level of the fluid at eye level

MANISCUS

X

What is the VOLUME of this liquid?

6.6 mL

What is the VOLUME of this liquid?

11.5 mL

What is the VOLUME of this liquid?

53.0 mL

What is the VOLUME of this liquid?

76.0 mL

What is the VOLUME of this liquid?

293.0 mL

• Using a GRADUATED CYLINDER–Item is dropped into a predetermined amount of

water in the cylinder.–The item places the cylinder–The item will displace the same amount of water as

its matter.–The difference between the original volume of

water and the level of the water with the object is its volume.

MATERIALS• Graduated Cylinder• Pipette (used to add or take out a fluid from

the cylinder)• Beaker (small) (used with the pipette)• 4.5 cm bolt• 7 cm bolt• 11 cm bolt• Ruler (to measure the bolts)

INSTRUCTIONS

• Make a table as seen below:

BOLT BEGINNING LEVEL (mL)

ENDING LEVEL (mL)

VOLUME (mL)

4.5 cm7.0 cm9.5 cm

Determine the VOLUME of each item

INSTRUCTIONS

• Make a table as seen below:

BOLT BEGINNING LEVEL (mL)

ENDING LEVEL (mL)

VOLUME (mL)

4.5 cm 50mL 56mL 6mL7.0 cm 50mL 59mL 9mL9.5 cm 50mL 61mL 11mL

Determine the VOLUME of each item

WEIGHTvs.

MASS

WEIGHT• A measurement of the force of gravity on

an object.• Weight can change with a location.

–On the moon a 120 pound person can weigh 20 pounds.

–You will weigh less the further away from the center of the earth.

MASS• The amount of matter in an object• Mass does not change with location.• Scientists prefer to measure the mass

of an object than its weight because weight changes with location.

The basic unit of weight and mass is

the GRAM (g)

What tool is used to measure the MASS of an

object?

Triple Beam Balance

Parts of a Triple Beam Balance

COUNTER WEIGHT

PAN

BASE

BEAMS

RIDERS BALANCEPOINTER

Instructions on useWith the pan empty, move the three riders on the three beams to their leftmost positions, so that the balance reads zero.

If the indicator on the far right is not aligned with the fixed mark, then calibrate the balance by turning the set screw on the left under the pan.

Once the balance has been calibrated, place the object to be measured on the pan.

Move the 100 gram rider along the beam to the right until the indicator drops below the fixed mark. The notched position immediately to the left of this point indicates the number of hundreds of grams.

Now move the 10 gram rider along the beam to the right until the indicator drops below the fixed mark. The notched position immediately to the left of this point indicates the number of tens of grams.

The beam in front is not notched; the rider can move anywhere along the beam. The boldface numbers on this beam are grams and the tick marks between the boldface numbers indicate tenths of grams.

To find the mass of the object on the pan, simple add the numbers from the three beams.

INSTRUCTIONS

• Make a table as seen below:

BOLT MASS (g)

4.5 cm

7.0 cm

9.5 cm

Determine the MASS of each item

INSTRUCTIONS

• Make a table as seen below:

BOLT MASS (g)

4.5 cm 47.4g

7.0 cm 72.3g

9.5 cm 97.5g

Determine the MASS of each item

DENSITY• Many objects have the same volume

but have different masses.• Density relates to the amount of

matter in a given volume.• Expressed as the number of grams in

a cubic centimeter • Formula is DENSITY = MASS ÷

VOLUME

1cm 1cm

1cm

WHY DO SOME OBJECTS FLOAT WHILE OTHERS

SINK?

MAKE THE CHART BELOWOBJECT VOLUME MASS DENSITY

WATER

L. Bolt

M. Bolt

S. Bolt

L. Clay

M. Clay

S. Clay

L. Wood

M. Wood

S. Wood

WHY DO SOME OBJECTS SINK WHILE OTHERS FLOAT?

COMPLETED CHART

OBJECT VOLUME MASS DENSITY

WATER 56.0mL 56.0g 1.0 g/mL

L. Bolt 11mL 97.5g 8.86 g/mL

M. Bolt 9mL 72.3g 8.0 g/mL

S. Bolt 6mL 47.4g 8.0 g/mL

L. Clay 17.0mL 26.3g 1.5 g/mL

M. Clay 9.0mL 15.0g 1.6 g/mL

S. Clay 4.0mL 6.9g 1.7 g/mL

L. Wood 21.0mL 7.4g .35 g/mL

M. Wood 14.0mL 4.7g .33 g/mL

S. Wood 3.0mL 2.4g .3 g/mL

BASED ON YOUR DATA WHY DO SOME OBJECTS FLOAT WHILE OTHERS SINK?

OBJECTS WITH A DENSITY LESS

THAN ONE WILL SINK IN WATER

If 5.6 mL of water has a mass of 5.6g, what

would be its DENSITY?

1 g/mL

If piece of clay measuring in volume 17.0 mL, has a mass of 26.3g, what would be its

DENSITY?

1.54 g/mL

If piece of 21.0 mL piece of wood had a mass of 7.4 g, what

would be its DENSITY?

.35 g/mL

If a 97.5g piece of metal had a volume of 11.0 mL, what would

be its DENSITY?

8.86 g/mL

INFERRING FROM THE DATA BELOW, WHY DO SOME OBJECTS SINK WHILE

OTHERS FLOAT?OBJECT VOLUME MASS DENSITY

WATER 56.0mL 56.0g 1.0 g/mL

L. Bolt 11mL 97.5g 8.86 g/mL

M. Bolt 9mL 72.3g 8.0 g/mL

S. Bolt 6mL 47.4g 8.0 g/mL

L. Clay 17.0mL 26.3g 1.5 g/mL

M. Clay 9.0mL 15.0g 1.6 g/mL

S. Clay 4.0mL 6.9g 1.7 g/mL

L. Wood 21.0mL 7.4g .35 g/mL

M. Wood 14.0mL 4.7g .33 g/mL

S. Wood 3.0mL 2.4g .3 g/mL

OBJECTS WITH A DENSITY LESS

THAN ONE WILL SINK IN WATER

TODAY IS THURSDAY November 6, 2008

• Get out your notebooks and be prepared to take quick notes.

• We will be starting the lab as soon as everyone is ready.

ON THE NEXT BLANK PAGE OF YOUR FOLDER….

• NUMBER 1- 15 on the left• NUMBER 16 – 30 in the middle

• NUMBER 31 – 50 on the right

• DO NOT SKIP LINES

WHAT IS TEMPERATURE?

A measure of the average kinetic energy of the individual particles of matter

What tool do you use to measure

TEMERATURE?

THERMOMETER

HOW DOES A THERMOMETER WORK?

• Temperature is measured with a thermometer usually made of a glass tube with colored alcohol.

• Certain materials have EXPANSION properties or they stretch when heated and shrink when cooled.

• As the air gets hotter, the level of the liquid rises and, as the air gets cooler, the level falls.

How do you read a THERMOMETER?

• Know the scale in which the thermometer is registering. (F, C, K)

• Look at the thermometer at eye level to get the correct reading.

What are the different scales

used to measure TEMERATURE?

Fahrenheit (F°)•Most common scale used in the United States

•Freezing is 32°F•Boiling is 212°F

Celsius (°C)•Most common scale used in other countries

•Freezing point is 0°C•Boiling point is 100°C

Kelvin (K)• Most commonly used in physical science• A Kelvin degree is the same size as a Celsius• Water freezes at 273K• Water boils at 373K• No more thermal energy can be removed at -

273K• -273K is called absolute zero

Fahrenheit to Celsius Conversion

Celsius= 5/9 X (Fahrenheit-32)EXAMPLE:

Convert 106°Fahrenheit into CelsiusCelsius =5/9 X (Fahrenheit -32)

Celsius = 5/9 X 74 Celsius = 41.11°

PRACTICE

Convert 72° Fahrenheit into CelsiusCelsius =5/9 X (Fahrenheit -32)

Celsius = 5/9 X (72°F- 32°F)Celsius = 5/9 X 42°F Celsius = 23.33C°

PRACTICE

Convert 168° Fahrenheit into CelsiusCelsius =5/9 X (Fahrenheit -32)Celsius = 5/9 X (168°F – 32°F)

Celsius = 5/9 X 136°F Celsius = 75.5C°

Celsius to Fahrenheit Conversion

Fahrenheit= (9/5 X Celsius) +32EXAMPLE:

Convert 41.11°C into FahrenheitFahrenheit = (9/5 X 41.1°C) + 32°F

Fahrenheit = 73.98°C + 32°F Fahrenheit = 106°F

PRACTICE

Fahrenheit= (9/5 X Celsius) +32EXAMPLE:

Convert 72°C into FahrenheitFahrenheit = (9/5 X 72°C) + 32°F

Fahrenheit = 129.6°C + 32°F Fahrenheit = 161.6F°

PRACTICE

Fahrenheit= (9/5 X Celsius) +32EXAMPLE:

Convert 127°C into FahrenheitFahrenheit = (9/5 X 127°C) + 32°F

Fahrenheit = 228.6°C + 32°F Fahrenheit = 260.6F°