Ch. 1.2 Measuring with Ch. 1.2 Measuring with Scientific UnitsScientific Units

OBJECTIVESOBJECTIVES

Identify the base units used in the SI Identify the base units used in the SI systemsystem

Explain the use of Scientific NotationExplain the use of Scientific Notation

Compare Volume, Mass, and DensityCompare Volume, Mass, and Density

Measure Length, Mass, and Temperature Measure Length, Mass, and Temperature using SI unitsusing SI units

Standards AddressedStandards Addressed

S6a-Use tools to observe and measure S6a-Use tools to observe and measure objects with appropriate precision & objects with appropriate precision & accuracyaccuracy

S4a-Big ideas and unifying concepts, such S4a-Big ideas and unifying concepts, such as order and organizationas order and organization

SystSystèèmméé International (SI) International (SI)

Base 10 system!!Base 10 system!!

See Table 1.2, page 11See Table 1.2, page 11– Length: meterLength: meter– Mass: kilogramMass: kilogram– Time: secondTime: second

VolumeVolumeThe amount of space that something occupiesThe amount of space that something occupies

SI unit is the cubic meter (mSI unit is the cubic meter (m33))

Smaller volumes measured with the cubic Smaller volumes measured with the cubic centimeter (cmcentimeter (cm33))

1 cm1 cm3 3 = 1 milliliter (ml)= 1 milliliter (ml)

Graduated cylinder measures liquid volumeGraduated cylinder measures liquid volume

Measure at the bottom Measure at the bottom

of the meniscusof the meniscus

Mass & WeightMass & Weight

Weight depends on gravityWeight depends on gravity

Mass does NOT!!Mass does NOT!!

Mass is the amount of matter (or STUFF) Mass is the amount of matter (or STUFF) in an objectin an object

SI unit of mass is the kilogramSI unit of mass is the kilogram

DensityDensityThe amount of matter packed into a given The amount of matter packed into a given volumevolume

Mass / volumeMass / volume

Units are grams / cmUnits are grams / cm33

Density is a characteristic property of a Density is a characteristic property of a substancesubstance

Density of water is 1g / cmDensity of water is 1g / cm33

Why will these objects sinkor float in water?

TemperatureTemperatureMeasure of heat energyMeasure of heat energy

Measured with a thermometerMeasured with a thermometer

SI temperature scale is CelsiusSI temperature scale is Celsius

Water freezes at 0Water freezes at 0° C (32° Fahrenheit)° C (32° Fahrenheit)

Water boils at 100° C (212° Fahrenheit)Water boils at 100° C (212° Fahrenheit)

TimeTimeSI unit is the SI unit is the secondsecond

1 millisecond = ?1 millisecond = ?

1/1000 of a second1/1000 of a second

60 sec = 1 minute60 sec = 1 minute

60 minutes = 1 hour60 minutes = 1 hour

24 hours = 1 day24 hours = 1 day

365 days = 1 year365 days = 1 year

How many seconds in an hour?How many seconds in an hour?

How many hours in a year?How many hours in a year?

Scientific NotationScientific NotationIs there an easier way to write Is there an easier way to write 23,000,000,000,000,000,000?23,000,000,000,000,000,000?

YES!!!!YES!!!!

Step 1: Make the number between 1 and 10 by Step 1: Make the number between 1 and 10 by placing the decimal to the proper “ new position”placing the decimal to the proper “ new position”

Step 2: Write the “new” number, followed by Step 2: Write the “new” number, followed by “ x 10“ x 10n n ””

Step 3: Count the number of places the decimal point Step 3: Count the number of places the decimal point moved from its original position to its new positionmoved from its original position to its new position

Step 4: Put the number of places moved in place of Step 4: Put the number of places moved in place of the “n” (This is called an exponent)the “n” (This is called an exponent)