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

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

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

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

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

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

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

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

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

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

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?

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

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!

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

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

Rules for Conversions

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