1. The SI System or How to Know “How Much?”

2. The Metric System Officially called the SI System Based on increments of 10 (one decimal place or zero) A good measurement has a number and a unit Prefixes on the unit name tell you how many zeroes to put before or after a number Used in every country around the world except the USA and Báhrain The official measurement system of the USA since the late 1800s

3. Why you don’t already know the Metric System Your parents didn’t know it No incentive for companies to switch You are still being taught the Imperial System through everyday experiences - Recipes - Consumer goods There is a slow, steady inclusion process

4. Base Units Base units are defined by only one measurement

5. Length Distance from one point to another Meters (m) are the base units (a little longer than a yard) For smaller items, centimeters (about one knuckle), and millimeters (the thickness of a dime) are used

6. Mass Amount of substance (number of particles) in an object Gram (g) is the base unit It is too small for some common measurements (about 1 paper clip of matter) Usually use the kilogram (kg) for basis of comparisons A kilogram is a little more than 2 pounds

7. Time How long it takes for something to happen Also called “Time Elapsed” or “Elapsed Time” Seconds (s) are the base unit Can lead to large numbers (1hr = 3600s)

8. What would you use to measure the length of your arm? 1234567891011121314151617181920 212223242526272829303132 1.Liters 2.Meters 3.Grams 4.Grams/Milliliter 20

9. What would you use to measure how much sugar is in one teaspoon? 1234567891011121314151617181920 212223242526272829303132 1.Liters 2.Meters 3.Grams 4.Kilograms 20

10. What would you use to measure how much you weigh? 1234567891011121314151617181920 212223242526272829303132 1.Liters 2.Meters 3.Grams 4.Kilograms 20

11. What would you use to measure the width of the room? 1234567891011121314151617181920 212223242526272829303132 1.Liters 2.Meters 3.Grams 4.Grams/Milliliter 20

12. Participant Scores 500Taylor Abbott400Shawn Weerts 500Ashlee Carlisle300Angel Loper 500Logan Chandler300Junior Williams 500Quanda Dickerson300Mercedes Matthieu 500Ivy Lopez200Shakira Griffin 500Alora Nordstrom 500Russ Partridge 500Damien Van Pelt 500Chantel Williams 400Angelica Ocasio

13. Derived Units of the SI System Derived units are defined by two or more measurements Volume Amount of space taken up by a substance Liters (L) are the base units (a little more than a quart) Liters are too large for some measurements, so milliliters (mL) are often used

14. What would you use to measure how much water is in a pool? 1234567891011121314151617181920 212223242526272829303132 1.Liters 2.Meters 3.Grams 4.Grams/Milliliter 20

15. More Derived Units Density Amount of matter in an object divided by the space taken up by the object “How much stuff is in how much space” Usually expressed in grams per milliliter (g/mL) for smaller amounts Expressed in kilograms per liter (kg/L) for larger amounts THE NUMBER DOES NOT CHANGE

16. SI Prefixes Used to show a number of base units Think of them as coefficients (multipliers) Easy to convert by sliding the decimal

17. SI Prefixes From the largest to the smallest kilo- hecto- deka- BASE deci- centi- milli- 1000 100 10 1 1/10 1/100 1/1000 “King Henry died by drinking chocolate milk.” Put your finger on the unit you have, move it to the unit you want Move your decimal the same number of places in the same direction that your finger moved

18. Testing your knowledge… Answer the five questions… Use the “Metric Ruler” to slide the decimal to get the desired units… Ready?

19. What is 25mm in m? 1234567891011121314151617181920 212223242526272829303132 1.2.5m 2.0.25m 3.0.025m 4.0.0025m 20

20. How many grams are 1.12kg? 1234567891011121314151617181920 212223242526272829303132 1.112g 2.0.00112g 3.0.112g 4.1120g 20

21. How many Liters are 591mL? 1234567891011121314151617181920 212223242526272829303132 1.0.591L 2.59.1L 3.0.059L 4.5.91L 20

22. What is 2.5cm in mm? 1234567891011121314151617181920 212223242526272829303132 1.250mm 2..25mm 3.25mm 4.0.025mm 20

23. 0.355L is how many mL? 1234567891011121314151617181920 212223242526272829303132 1.3.55mL 2.35.5mL 3.355mL 4.3550mL 20