1. The Metric System

2. International System of Units
Measurement
Scientists use a single, standard system of measurement called ___________ or __________________________________________ SI
International System of Units

3. Based on powers of

4. Mass - Volume - Length - Time -
Main Base Units
Mass - Volume - Length - Time -
Gram (g)
Liter (L)
Meter (m)
Second (s)

5. Prefixes change the value of the base units.

6. Base unit Deci- Centi – Milli- Larger Unit Prefixes
Kilo-
1000
To convert to a smaller unit, move decimal point to right or multiply
Hecto –
100
Deca- 10
Base unit
Deci-
1/10 or 0.1
To convert to a larger unit, move decimal point to left or divide
Centi –
1/100 or 0.01
Milli-
1/1000 or 0.001
Smaller Unit Prefixes

7. Try these practice conversions…

8. 1000 mg = ______ g ?
1st – What is the base unit? 2nd – Going from smaller mg to larger g 3rd – move decimal 3 places to the left
Answer is: 1 g

9. 1 L = _____ mL ?
1st – What is the base unit? Liters 2nd – Going from larger L to smaller ml 3rd – move decimal 3 places to the right
Answer is: mL

10. 160 cm = _____ mm ?
1st – Going from larger cm to smaller mm 2rd – move decimal 1 place to the right
Answer is: mm

11. 14 km = _____ m
1st – Going from larger km to smaller m 2rd – move decimal 3 places to the right
Answer is: 14,000 m

12. 75 mL = _____ L
1st – Going from smaller mL to larger L 2rd – move decimal 3 places to the left
Answer: L

13. Simple Metric Conversions to Remember:

14. 1 meter = 100 cm
1 meter = 1000 mm
1 cm = 10 mm

15. 1 Kilometer (km) = 1000 meters (m)
1 Kilogram (kg) = 1000 grams (g)
1000 Kilograms (kg) = 1 metric ton (t)
1 Gram (g) = 1000 milligrams (mg)
1 Liter (L) = 1000 milliliters (mL)
1 Liter (L) = 1000 cubic centimeters (cm3)

16. Time 60 seconds in a minute 60 minutes in an hour 24 hours in a day
52 weeks in a year
365 ¼ days in a year

17. C° = (F° - 32) x 5/9 Temperature Celsius C°
To convert from Fahrenheit to Celsius use this equation:
C° = (F° - 32) x 5/9

18. * Units written as cubed – for ex. cm3
Formulas
Volume – how much space an object occupies
V = l x w x h
* Units written as cubed – for ex. cm3

19. * Obtain mass in grams or mg on balance
Formulas
Density – how tightly packed matter is within an object
D = Mass/Volume
* Obtain mass in grams or mg on balance
Units written as grams/cm3 or grams/mL

20. Finding the Mean Take the average Ex: 92, 95, 94, 89, 100
1. Add up all the data points
2. Divide by total number of data points
Ex: , 95, 94, 89, 100
1st = 470
2nd ÷ 5 = ?
Answer is : 94

21. Graphing
Techniques

22. 1. X- Axis
Contains the independent variable

23. Y - axis
Contains the dependent variable

24. 3. Numbering intervals on each axis must be consistent
Acceptable:
5, 10, 15, 20, 25, 30 ….etc.
1, 2, 3, 4, 5, 6, 7 ….
100, 200, 300, 400, 500 …
NOT: 3, 5, 6, 10, 21, 33

25. 4. Each axis must be labeled
Tell what is being shown on each axis
Give the units of measurement where appropriate

26. 5. Give your graph a TITLE!

27. If you are graphing more than one set of data points on a graph, set up a color key to distinguish between the different lines