Agenda Bell Work• Review for Safety Quiz• Safety Quiz

• Notes: Systems of Measurement

• Modern Marvels: Measurement

What is Missing?What is Missing?

Brad’s shoe is 28Brad’s shoe is 28 The caterpillar we observed was 4 longThe caterpillar we observed was 4 long Karen ran 50Karen ran 50 Steven’s little sister is 1 old.Steven’s little sister is 1 old. Allison’s plant grew 11 tall.Allison’s plant grew 11 tall. The scientist used a piece of wire 30 long The scientist used a piece of wire 30 long

to connect the device to her equipmentto connect the device to her equipment

Units of Measurements

Units Type of Measurement

Systems of Systems of MeasurementMeasurement

February 5, 2013February 5, 2013

ObjectivesObjectives

1.1. Define a Standard of MeasurementDefine a Standard of Measurement

2.2. Name the prefixes for the SI unitsName the prefixes for the SI units

3.3. Identify units of time, mass, volume, Identify units of time, mass, volume, density, temperature, and lengthdensity, temperature, and length

Standards of MeasurementStandards of Measurement

A reference point against which other A reference point against which other things can be evaluatedthings can be evaluated

Handful of cheerios?Handful of cheerios?

Standards of MeasurementStandards of Measurement

SI UnitsSI Units

Based on the metric Based on the metric systemsystem

QuantityQuantity UnitUnit SymbolSymbol

LengthLength MeterMeter mm

MassMass KilogramKilogram kgkg

TimeTime SecondSecond ss

ForceForce NewtonNewton NN

EnergyEnergy JouleJoule JJ

CurrentCurrent AmpereAmpere AA

TemperatureTemperature KelvinKelvin KK

Other UnitsOther Units

Volume = L x W x HVolume = L x W x H cmcm3 3 or mLor mL

mm3 3 or Lor L

Density = Mass/VolumeDensity = Mass/Volume g/cmg/cm33

kg/mkg/m33

PrefixesPrefixesPrefixPrefix SymbolSymbol DefinitionDefinition

kilo-kilo- kk thousandthousand

hecto-hecto- hh HundredHundred

deka-deka- dada tenten

deci-deci- dd tenthtenth

centi-centi- cc hundredthhundredth

milli-milli- mm thousandththousandth

Metric System

Metric System is based on Units and prefixes

Prefix + Unit = Metric Measurement

Centi + Meter = Centimeter Kilo + Liter = Kiloliter

So if you needed to measure length you would choose meter as your base unit

Length of a tree branch• 1.5 meters

Length of a room • 5 meters

Length of a ball of twine stretched out• 25 meters

ExamplesExamples

11 Kilo Kilogram = 1000 gramsgram = 1000 grams

4 4 KiloKilograms = 4000 gramsgrams = 4000 grams

1 1 CentiCentimeter = .001 metermeter = .001 meter

100 100 CentiCentimeter = 1 metermeter = 1 meter

2000 milliliters = 1 liter2000 milliliters = 1 liter

5 liters = .005 kiloliters5 liters = .005 kiloliters