Measuring With

Scientific Units

MEASUREMENT

• MEASUREMENT• Measurement is in NUMBERS

and UNITS.• Most of the world uses the

METRIC SYSTEM– Based on the ‘NUMBER TEN’ – Based on the METER

MEASUREMENT: SYMBOLS

Base quantity Name Symbol

Length meter m

Mass gram g

Time seconds s

electric current Ampere A

temperature       Celsius oCamount of substance Mole molluminous intensity Candela Cd

MEASUREMENT: UNITS

• REVIEW: LENGTHMETER: distance

REVIEW: VOLUMELITER: Volume = length x width x height =

cm3

MEASUREMENT: UNITS

WEIGHT AND MASSGRAM: mass & weight• WEIGHT depends on WHERE YOU ARE IN

THE UNIVERSE– Changes depend on GRAVITY

• Mass depends on THE NUMBER AND TYPE OF ATOMS– ALWAYS STAYS THE SAME

MEASUREMENT: UNITS

• TEMPERATURE AND TIMECELSIUS: temperature• TEMPERATURE measures AMOUNT OF

HEAT– WHAT IS YOUR BODY TEMPERATURE?– 98.6 degrees Fahrenheit– 37 degrees Celsius

SECONDS: time• TIME measures ORDER OF EVENTS

MEASUREMENT: UNITSDENSITY• GRAMS PER VOLUME:

density• Density = AMOUNT OF MASS

PER VOLUME= grams / milliliter= grams / cm3

= MASS / VOLUMEPURE WATER = 1g / mL

LEAD = 11g / mL

MEASUREMENT: PREFIXES

Prefix Symbol

Factor Number Factor Word

kilo k 1,000 units Thousandhecto h 100 units Hundreddeca da 10 units Ten

Base unit m, g, L 1 unit meter, gram, Liter

deci d 1/10 unit Tenthcenti c 1/100 unit Hundredthmilli m 1/1,000 unit Thousandth

micro 1/1,000,000 unit Millionth

MEASUREMENT: PREFIXES

king hector doesn’t buy dragons costing millions

CONVERSIONS

Conversions are easy because they’re BASED ON THE NUMBER TEN

• Just MOVE THE DECIMAL!Setting up the Divisionsk h da base d c m1,000 units 100 units 10 units 1 unit 1/10 unit 1/100 unit

1/1,000 unit

CONVERSIONS

k h da base d c m1,000 units 100 units 10 units 1 unit 1/10 unit 1/100 unit 1/1,000 unit

• If you’re going from SMALL amounts to LARGE amounts, move the decimal TO THE LEFT

• 300 centimeters = 3.00 meter• 56 liters = ______ kiloliters? • .056 kL• 82.3 milligrams = _______ decigrams?• .823 dg

CONVERSIONS

k h da base d c m1,000 units 100 units 10 units 1 unit 1/10 unit 1/100 unit 1/1,000 unit

• If you’re going from LARGE amounts to SMALL amounts, move the decimal TO THE RIGHT

• 95 grams = 95,000 milligrams• 20.5 decameters = _________ meters?• 205 m• 6.82 liters = .0682 cL centiliters?

• Good job! 682 cL