The Measurement of The Measurement of ScienceScience

Why do we use the Metric Why do we use the Metric System and SISystem and SI• Most of the world uses it!!! Most of the world uses it!!!

– ITIT’’S UNIVERSALS UNIVERSAL

• Metric System- system of measurement Metric System- system of measurement based on the number 10based on the number 10

• SI (System international)- adaptation of the SI (System international)- adaptation of the metric system regulated by International metric system regulated by International Bureau of Weights and Measures. Bureau of Weights and Measures.

What does it measure?What does it measure?• LengthLength (how long)(how long)

– The The MeterMeter is the basic unit is the basic unit• A little longer than a yardA little longer than a yard• Meterstick, rulerMeterstick, ruler

• Mass (how much stuff its made of)Mass (how much stuff its made of)– The The GramGram is the basic unit is the basic unit

• A paper clip is about 2 gramsA paper clip is about 2 grams• scalescale

• Volume (how much space it takes)Volume (how much space it takes)– The The Liter Liter is the basic unitis the basic unit

•One liter bottle vs 2 liter bottleOne liter bottle vs 2 liter bottle•Graduated cylinder, beakerGraduated cylinder, beaker

SI PrefixesSI Prefixes• Prefixes are are used to change units by a Prefixes are are used to change units by a

factor of 10factor of 10– Kilo = 1000Kilo = 1000 abbreviation - Kabbreviation - K– Hecto = 100Hecto = 100 abbreviation - Habbreviation - H– Deka = 10Deka = 10 abbreviation - Dabbreviation - D– Deci = 0.1Deci = 0.1 abbreviation - dabbreviation - d– Centi = 0.01Centi = 0.01 abbreviation - cabbreviation - c– mili = 0.001mili = 0.001 abbreviation - mabbreviation - m

• Example: if you travel 2 Example: if you travel 2 kilokilometers you have traveledmeters you have traveled– 2000 meters! Kilo stands for 10002000 meters! Kilo stands for 1000

Using a rulerUsing a ruler

Parallex ErrorParallex Error

• The error caused by reading The error caused by reading measurements from an angle. measurements from an angle.

• Example- reading a speedometer Example- reading a speedometer from the passengers side. from the passengers side.

How do we convert from How do we convert from one measurement to one measurement to

another?another?

How do I remember that?How do I remember that?

KKing ing HHenry enry DDoesn’t oesn’t UUsually sually DDrink rink CChocolate hocolate MMilkilk

TRY THIS USING THE STAIRCASE METHOD

1000 mg = ______ g •Step 1: Determine if you are going to go up or down the ladder.

•Step 2: Determine how many steps there are from milligrams to grams.

•Step 3: Move the decimal point the amount of places that was determined in steps 1 & 2.

1.0

TRY THIS USING THE STAIRCASE METHOD

•0.15 L = __________ ml

•25.6 cm= __________ m

•150,000 mg=_________ kg

150

0.256

0.15

Using a Graduated CylinderUsing a Graduated Cylinder

Measure to the bottom of the Measure to the bottom of the curvecurve

You should be at eye You should be at eye level with the liquidlevel with the liquid