the metric system. measurement scientists use a single, standard system of measurement called...
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The Metric System
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Measurement
Scientists use a single, standard system of
measurement called ___________ or
__________________________________________
SISIInternational System of UnitsInternational System of Units
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Based on powers of
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Main Base Units
Mass -
Volume -
Length -
Time -
Gram (g)Gram (g)
Liter (L)Liter (L)
Meter (m)Meter (m)
Second (s)Second (s)
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Prefixes change the value of the base units.
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Base unit
Kilo-
1000
Hecto –
100Deca-
10
Deci-
1/10 or 0.1 Centi –
1/100 or 0.01
Milli-
1/1000 or 0.001
Larger Unit PrefixesLarger Unit Prefixes
Smaller Unit PrefixesSmaller Unit Prefixes
To convert to a larger unit, move decimal point to left or divide
To convert to a smaller unit, move decimal point to right or multiply
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Try these practice conversions…
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1000 mg = ______ g ?
1st – What is the base unit? 2nd – Going from smaller mg to larger g3rd – move decimal 3 places to the left
Answer is: 1 g1 g
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1 L = _____ mL ?
1st – What is the base unit? Liters2nd – Going from larger L to smaller ml3rd – move decimal 3 places to the right
Answer is: 1000 mL1000 mL
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160 cm = _____ mm ?
1st – Going from larger cm to smaller mm
2rd – move decimal 1 place to the right
Answer is: 1600 mm1600 mm
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14 km = _____ m
1st – Going from larger km to smaller m
2rd – move decimal 3 places to the right
Answer is: 14,000 m14,000 m
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75 mL = _____ L
1st – Going from smaller mL to larger L
2rd – move decimal 3 places to the left
Answer: 0.075 L0.075 L
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Simple Metric Conversions to Remember:
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• 1 meter = 1 meter = 100 cm• 1 meter =1 meter = 1000 mm• 1 cm =1 cm = 10 mm
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• 1 Kilometer (km) = 1 Kilometer (km) = 1000 meters (m)• 1 Kilogram (kg) = 1 Kilogram (kg) = 1000 grams (g)
• 1000 Kilograms (kg) = 1000 Kilograms (kg) = 1 metric ton (t)
• 1 Gram (g) = 1 Gram (g) = 1000 milligrams (mg)• 1 Liter (L) = 1 Liter (L) = 1000 milliliters (mL)• 1 Liter (L) = 1 Liter (L) = 1000 cubic centimeters (cm3)
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Time
• 60 seconds in a minute• 60 minutes in an hour• 24 hours in a day• 52 weeks in a year• 365 ¼ days in a year
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Temperature
• Celsius CCelsius C°°
To convert from Fahrenheit to Celsius use this equation:
C° = (F° - 32) x 5/9 C° = (F° - 32) x 5/9
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FormulasVolume – how much space an object occupies
VV == l l xx w w xx h h
* Units written as cubed – for ex. cm3
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FormulasDensity – how tightly packed matter is within an object
DD == Mass/VolumeMass/Volume
* Obtain mass in grams or mg on balance
Units written as grams/cm3 or
grams/mL
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Finding the Mean• Take the average
1. Add up all the data points
2. Divide by total number of data points
Ex: 92, 95, 94, 89, 10092, 95, 94, 89, 1001st - 92 + 95 + 94 + 89 + 100 = 470
2nd - 470 ÷ 5 = ?
Answer is : 94
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GraphingTechniques
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1. X- Axis
Contains the independent variable
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Y - axis
Contains the dependent variable
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3. Numbering intervals on each axis must be consistent
Acceptable:Acceptable:5, 10, 15, 20, 25, 30 ….etc.1, 2, 3, 4, 5, 6, 7 ….100, 200, 300, 400, 500 …
NOTNOT: 3, 5, 6, 10, 21, 33
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4. Each axis must be labeled
• Tell what is being shown on each axis
• Give the units of measurement where appropriate
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5. Give your graph a TITLE!
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If you are graphing more than one set of data points on a graph, set up a color
key to distinguish between the different lines
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