Standards of Standards of MeasurementMeasurement

Section 1-2Section 1-2

Units and StandardsUnits and Standards

•

Metric units includeMetric units include

• StandardStandard

ExampleExample

No meter stickNo meter stick Will the desk fit through the door?Will the desk fit through the door? Measure with my handsMeasure with my hands Measure with your handsMeasure with your hands No standard!No standard!

International System of UnitsInternational System of Units

Abbreviated Abbreviated SISI from from

Improved version of the metric Improved version of the metric systemsystem

Each SI measurement has a Base Each SI measurement has a Base unitunit• Length –Length –• Mass -Mass -

SI PrefixesSI Prefixes

Based on Multiples of 10Based on Multiples of 10

Converting SI UnitsConverting SI Units

BridgesBridges Top of Bridge =Top of Bridge = 1 meter = dm1 meter = dm 1 meter = cm1 meter = cm 1 meter = mm1 meter = mm 1000 meters = km1000 meters = km

Convert the following:Convert the following:

1.255 liters to ml1.255 liters to ml

3075 cm to m3075 cm to m

More conversions:More conversions:

11cm to mm11cm to mm

675 m to km675 m to km

345 mm to km345 mm to km

Measuring DistanceMeasuring Distance

Base unit =Base unit = Size of the object Size of the object

Activity pg.17Activity pg.17

13mm is easier to understand than 13mm is easier to understand than 0.013m0.013m

Measuring VolumeMeasuring Volume

Volume =Volume =

Volume = (for solids)Volume = (for solids) Liquid volumes are measured inLiquid volumes are measured in

1 Liter = dm1 Liter = dm33

1 Liter = ml1 Liter = ml 1 cm1 cm33 = ml = ml

ConversionsConversions

1.5 liters to ml1.5 liters to ml

1.5 liters to cm1.5 liters to cm33

Measuring MatterMeasuring Matter

Mass = Mass =

Ping pong ball and golf ball have the Ping pong ball and golf ball have the

Density =Density =• Unit for density could be g/cmUnit for density could be g/cm33

If an object has a mass of 10g and a If an object has a mass of 10g and a volume of 2 cmvolume of 2 cm33 • Density =Density =

Measuring Time and Temp.Measuring Time and Temp.

Base unit for timeBase unit for time Base unit for temp. Base unit for temp.

• Most scientific work is done using celsiusMost scientific work is done using celsius• 0 Kelvin is the coldest possible temp. 0 Kelvin is the coldest possible temp.

also know asalso know as• 0 kelvin= -2730 kelvin= -27300C (273 degrees below C (273 degrees below

the freezing pt. of water)the freezing pt. of water)