SI units are used for



SI units are used for ________________________.

SI is based on the ____________ system and uses the _______________ SI base units listed below.

SI Base Units

|Quantity |Unit |Abbreviation |

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SI uses ________________ for very ___________ and very ______________ measurements.

These _______________ are all multiples of _______.

Prefixes Used for Large Measurements

|Prefix |Symbol |Meaning |Multiple of base unit |

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Prefixes Used for Small Measurements

|Prefix |Symbol |Meaning |Multiple of base unit |

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Exercise 1

Find three things in the room that measure approximately a meter.

|Item Measured |Actual Measurement (to the nearest mm) |

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Find three things in the room that measure approximately a decimeter.

|Item Measured |Actual Measurement (to the nearest mm) |

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Find three things in the room that measure approximately a centimeter.

|Item Measured |Actual Measurement (to the nearest mm) |

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Find three things in the room that measure approximately a millimeter.

|Item Measured |Actual Measurement (to the nearest mm) |

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It is _________ to convert SI units to _____________ or ______________ units.

Remember that to make a _____________________, it takes more of a __________ unit or ____________ of a _____________ unit.

Example: A person’s height could be ________ m, a fairly small number. In centimeters, the same height would be __________ cm, a larger number.

If you are converting to a ____________ unit, ______________ the measurement to get a _____________ number. (so the multiple goes on top)

Example:

[pic]

If you are converting to a ____________ unit, ______________ the measurement to get a ______________ number. (so the multiple goes on bottom)

Example:

[pic]

Group Practice:

1. Convert 15 m to cm.

X =

2. Convert 80 dm to m.

X =

3. Convert 5 km to m.

X =

On your own

1. Write 550 millimeters as meters.

2. Write 3.5 s as milliseconds.

3. Convert 1.6 kilograms to grams.

4. Convert 2500 milligrams to kilograms.

5. Change 2800 millimoles to moles.

6. Change 6.1 amperes to milliamperes.

Converting from one prefixed unit to another.

Example:

Convert 160 centimeters to decimeters.

[pic]

Convert 56 kilometers to centimeters.

[pic]

Group Practice

Convert 6 Megaseconds to microseconds.

On your own

7. Convert 4 centimeters to micrometers.

8. Convert 3 micrograms as nanograms.

9. Change 14 decimeters to kilometers.

10. Write 1900000 centimeters as Megameters.

Review:

1. How many factors, or variables, are tested in an ideal experiment?

2. Explain the difference between SI base units and derived units. Give an example of each.

Organizing Data

Line Graphs:

A line graph is best for _________________ data that ______________.

Line graphs are usually made with the __-axis showing the _____________________ variable and the __-axis showing the _________________ variable.

| | |

|0 |0 |

|10 |3 |

|20 |6 |

|30 |12 |

|40 |25 |

|50 |43 |

|60 |58 |

|70 |72 |

|80 |100 |

|90 |116 |

|100 |140 |

|110 |147 |

|120 |152 |

|130 |154 |

|140 |156 |

|150 |156 |

|160 |156 |

|170 |156 |

Bar Graphs:

A ________ graph is useful when you want to _______________ similar data for _____________ individual items or events.

|Element |Melting temp (K) |

|Aluminum |933 |

|Gold |1337 |

|Iron |1808 |

|Lead |601 |

|Silver |1235 |

Pie Charts:

A _____ chart is ideal for ________________ data that are parts of a __________. (Usually expressed as __________________.)

[pic]

Review:

3. Describe the kind of data that is best displayed as a line graph. Give several examples.

4. Describe the kind of data that is best displayed as a pie chart. Give an example of data from everyday experiences that could be placed on a pie chart.

To _____________ the number of __________, you can express values as a simple number ____________ by a power of ____.

Scientific Notation is a _____________ of _______________ a quantity as a number ______________ by _____ to an appropriate _______________.

|Power of 10 |Decimal Equivalent |

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Examples:

4 500 000 000 000 m =

When moving decimal to left, exponent _______________.

0.000 000 000 000 45 s =

When moving decimal to the right, exponent _______________.

3.0 x 108 m/s =

6.5 x 10-6 g =

On your own

Write the following measurements in scientific notation.

1. 800 000 000 m

2. 0.0015 kg

3. 60 200 L

4. 0.000 95 m

5. 8 002 000 km

6. 0.000 000 000 06 kg

Using Scientific Notation

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