1. Chapter 1 Metric Units PS 12:1 PS 12:2

2.  If I tell you that I have 11, what do you know?  For a measurement to make sense, it requires both a # and a unit.  EX: I have 11 brothers/sisters.  You should always express measurements in # ’ s and a unit so that their meaning is clear. Many units that you are familiar with are not units used in science( feet, inches, Fahrenheit) SI Units of Measurement

3. SI Continued  Scientists use a set of measuring units called SI, or the International System of Units  This is a revised version of the metric system.  By everyone using the SAME system of units, scientists can easily interpret one another ’ s measurements.

4. 7 Base Units  The seven are listed on page 16  Length – meter (m)  Mass – gram (g)  Volume – Cubic meter (m 3 ) = Liter(L)  Length: straight-line distance between 2 points  Mass: quantity of matter in an object/sample  Volume: amount of space taken up by an object

5.  Density = Mass = Kg Volume m 3 Now let ’ s practice a little with converting within SI kids hate dances because dj ’ s cruddy music k,h,da,base,d,c,m Kilo., hecta, deca., base, deci., cent., milli. Density – kg/m 3 Density: the ratio of an object ’ s mass to its volume

6.  EX: 5kg = _____ g  5.0kg = ______g  Move the decimal 3 spaces to the right to get to the base unit gram  K,ha,da,base(gram is the base unit)  Answer:  5kg = 5000g  Use this ex and complete the worksheet Worksheet practice

7. Metric Conversions Ladder Method T. Trimpe 2008 http://sciencespot.net/

8. KILO 1000 Units HECTO 100 Units DEKA 10 Units DECI 0.1 Unit CENTI 0.01 Unit MILLI 0.001 Unit Meters Liters Grams Ladder Method How do you use the “ ladder ” method? 1 st – Determine your starting point. 2 nd – Count the “ jumps ” to your ending point. 3 rd – Move the decimal the same number of jumps in the same direction. 4 km = _________ m 1 2 3 How many jumps does it take? Starting Point Ending Point 4. 1 __. 2 3 = 4000 m

9. Try these conversions using the ladder method. 1000 mg = _______ g 1 L = _______ mL160 cm = _______ mm 14 km = _______ m109 g = _______ kg 250 m = _______ km Conversion Practice Compare using, or =. 56 cm 6 m 7 g 698 mg

10. Write the correct abbreviation for each metric unit. 1) Kilogram _____ 4) Milliliter _____ 7) Kilometer _____ 2) Meter _____ 5) Millimeter _____ 8) Centimeter _____ 3) Gram _____ 6) Liter _____ 9) Milligram _____ Try these conversions, using the ladder method. 10) 2000 mg = _______ g 15) 5 L = _______ mL 20) 16 cm = _______ mm 11) 104 km = _______ m 16) 198 g = _______ kg 21) 2500 m = _______ km 12) 480 cm = _____ m 17) 75 mL = _____ L 22) 65 g = _____ mg 13) 5.6 kg = _____ g 18) 50 cm = _____ m 23) 6.3 cm = _____ mm 14) 8 mm = _____ cm 19) 5.6 m = _____ cm 24) 120 mg = _____ g Metric Conversion Challenge

11. Compare using, or =. 25) 63 cm 6 m 27) 5 g 508 mg 29) 1,500 mL 1.5 L 26) 536 cm 53.6 dm 28) 43 mg 5 g 30) 3.6 m 36 cm

12.  -indicates how many times a unit should be multiplied or divided by ten  Figure 15 on page 17 shows some common metric prefixes  EX 9ms = 9 s = 0.009s 1000 *Note – dividing by 1000 same as multiplying by 0.001 Metric Prefixes http://www.metricamerica.com/mediasays.htm http://www.homeschoolmath.net/worksheets/measuring.php

13. -- can make a unit larger EE X 12 km = 12 x 1,000m = 12,000 m CC onversion Factors – a ratio of equivalent measurements that is used to convert a quantity expressed in one unit to another unit. LL et ’ s look together on page 18 of you text to work through an example of this FACTOR LABEL Method More on metric prefixes

14.  Thermometer – thermo(heat)meter(measure) An instrument that measures temperature, or how hot an object is. Let ’ s look at page 21 together Fahrenheit and Celsius and kelvin conversions Copy the formulas found on page 20 into your notes Measuring Temperature

15.  K = 0 C + 273 formula  Convert 205 K = ______ 0 C 205k – 273 = -68 0 C 42 0 C = ___ K 42 0 C + 273 = 315K Practice converting temp.

16.  0 C = (F – 32) x 5/9 AND F = 0 C x 9/5 + 32  Copy the example from the bottom of Page 878 in your text into your notes  Do the following conversions on your own for practice using the example you just copied  33.182F = _____ 0 C  14F = _____ 0 C More practice

17.  65C = _____F  22C = _____F One more set of practice in F

18.  Length Temperature  Mass Volume  Time Electric Current  Second (s) Ampere (a)  Kelvin (k) Meter (m)  Liter (l) Kilogram (kg) What unit to use when?

19. Presenting Sci. Data  Organizing Data – Scientists organize data using tables and graphs.  These make it easier to spot patterns/trends to support of disprove their hypothesis Data Tables- the simplest way to organize data

20. Organizing data  Line Graphs – Useful for showing changes that occur in related variables  Manipulated variable – x-axis  Responding variable – y-axis Slope = Rise Run

21. Direct proportion –As one goes up/down the other goes up/down the same amount Inverse proportion – As one goes up/down the other goes down/up Thumb demonstration Look at fig. 22 Do Data Analysis page 24

22. More organizing data BB ar Graphs- often used to compare a set of measurements, amounts, or changes. CC ircle Graphs- a divided circle that shows how the part or share of something relates to the whole.