2. 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. SI units are based on multiples of 10. We will be using SI and other metric units.

3. The Metric System  The SI system is considered to be the modern metric system.  It is considered a universal language for scientists, doctors, the military, and most countries.  The US is one of the only countries not on the metric system.  We use The English System which includes mph, feet, pounds, gallons, Farenheit, etc.. Why do you think the US has not switched to the Metric System?

4. Basic Units Length = meter (m) Mass = gram (g) Volume = Liter (L) Temperature = degrees celcius (°C)

5. Rule of Dimensional Analysis Larger unit to smaller unit, you multiply by 10 or powers of 10 Smaller unit to larger unit, you divide by 10 or powers of 10 Kind humans don’t makedogs climb mountains. Kilo hectadeca meterdeci centimilli Liter gram

6. Let’s look at the table on your worksheet: Kiloliter (kL) Hectoliter (hL) Decaliter (daL) Liter (L) Deciliter (dL) Centiliter (cL) Milliliter (mL) 0.46834.68346.83468.34,68346,830468,300 You will finish the rest later!

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 m7 g 698 mg 1.010001600 14,0000.109 0.250 < >

10. Why use Graphs? Because of their visual nature, graphs can reveal patterns or trends that words and data tables cannot. Scientists commonly use bar graphs, circle graphs, and line graphs.

11. The Importance of Graphs Line graphs are used to display data to show how one variable changes in response to another variable. In this experiment, the responding variable is the time it takes for the water to boil. The manipulated variable is the volume of water in the pot.

12. Plotting a Line Graph: