1. Q: What is the Metric System? Called the System International (French) The metric system is used by all scientists and by everyone in most countries (except us!). WE will be working with 5 base units

2. 5 base units Standard Measurement Length Mass Time Temperature Amount of Substance Name of Unit Meter Gram Second Centigrade (Celcius) Mole Symbol m g s C Mol

3. Prefixes for LARGE Measurements Prefix= Mega Symbol= M Meaning= Million Multiple of Base Unit= 1,000,000 aka. How much bigger is it than just one base unit? EXAMPLE: 1 Megameter (Mm)= ______ Meters 1 Megameter = 1,000,000 Meters

4. Prefixes for LARGE Measurements Prefix= Kilo Symbol= K Meaning= Thousand Multiple of Base Unit= 1,000 aka. How much bigger is it than just one base unit? EXAMPLE: 1 Kilogram (Kg)= ______ Grams 1 Kilogram = 1,000 Grams

5. Prefixes for LARGE Measurements Prefix= Hector Symbol= H Meaning= Hundred Multiple of Base Unit= 100 aka. How much bigger is it than just one base unit? EXAMPLE: 1 Hectosecond (Hs) = ____ seconds 1 hectosecond = 100 seconds

6. Prefixes for LARGE Measurements Prefix= Deka Symbol= Dk, Da Meaning= Ten Multiple of Base Unit= 10 aka. How much bigger is it than just one base unit? EXAMPLE: 1 Dekamole (Dkmol)= ______ Moles 1 Dekamole = 10 Moles

7. Prefixes for SMALL Measurements Prefix= deci Symbol= d Meaning= tenth Multiple of Base Unit= 1/10 or 0.1 aka. How much bigger is it than just one base unit? EXAMPLE: 1 decimeter (dm) = ______ Meter 1 decimeter = 1/10 Meter

8. Prefixes for SMALL Measurements Prefix= centi Symbol= c Meaning= hundreth Multiple of Base Unit= 1/100 or 0.01 aka. How much bigger is it than just one base unit? EXAMPLE: 1 centigram (cg) = ______ gram 1 centigram = 1/100 gram

9. Prefixes for SMALL Measurements Prefix= milli Symbol= m Meaning= thousandth Multiple of Base Unit= 1/1000 or 0.001 aka. How much bigger is it than just one base unit? EXAMPLE: 1 millisecond (ms) = ______ second 1 millisecond = 1/1000 second

10. Prefixes for SMALL Measurements Prefix= micro Symbol= µ Meaning= millionth Multiple of Base Unit= 1/1,000,000 or 0.000001 or 1x10 6 aka. How much bigger is it than just one base unit? EXAMPLE: 1 micromole (µmol) = ______ mol 1 micromole = 0.000001 mol

11. So we can convert from one unit to another This will help show how things are related in terms of size, amount, time, temp, etc. We call the conversion from one unit to another DIMENSIONAL ANALYSIS Q: Why do we use the metric system?

12. Rules for Conversions Hint 1: –Always start by writing down what you know (what are you given?) Hint 2: − If you have 2 units with prefixes, convert to the base unit first

13. Rules for Conversions 1.Set up the units so that unwanted units cancel out Hint 3: If a unit was previously on top, it must go on bottom to cancel!

14. Rules for Conversions 2. Draw your DA grid and add in appropriate numbers.

15. Rules for Conversions 3. Cancel the units, complete the math - multiplying ALL the top numbers together - Multiplying ALL the bottom numbers together - Divide your top answer by your bottom answer

16. Rules for Conversions

17. EXAMPLES How many kilometers are in 100 meters? How many millimeters are in 10 cm? How many decimeters are in 0.002 kilometers?