unit 1—nature of science - plainvie intro 2016.pdfsi measurements important base units to...
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SI Measurements(also known as “metric system”)
• “SI” stands for “System International” or “International System of Measurement”
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(2016)
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Why is the Metric System better?
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–Common Language for scientists
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–Based on units of 10
–Multiply or divide when converting units
– move the decimal point
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–Prefixes determine “how much” of a unit
–Prefixes represent values (amounts).
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BASE UNITS
• Used to identify what type of measurement is being made.
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SI MeasurementsImportant BASE units to remember:
METERS = m• Length is the distance between two points.
• measures distance or length• Measure with metric ruler or meterstick
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SI Measurements
• Smaller lengths are measured in centimeters or millimeters
• Longer lengths are measured in kilometers
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LITERS = L• measures volume — how much space something takes up
• Measure withgraduated cylinder
• Smaller volumes measured in milliliters.
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Volume of a rectangular solid (cube)• SI unit for the volume for rectangular solids is cubic centimeters.(cm )
• (length x height• x width) cm• cm X cm X cm• Cubic centimeter
1 mL = 1 cm
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GRAMS = g• measures mass• Mass is the amount of matter in an object.
• Smaller masses measured in milligrams, larger in kilograms.
• Measure with triple beam balance
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oCELSIUS = oC• Measures temperature• Measured with a thermometer
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PREFIXES
k = kilo- (means “1000”)h = hecto-(means “100”)da = deca-(means “10”)
BASE UNIT (liter, meter, gram)d = deci-(means “1/10” or 0.1)c = centi- (means “1/100” or .01)m = milli- (means “1/1000” or .001)
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Easy way to remember the order of prefixes:Kids Have
Dreams But
DreamsCost
Money
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Metric Conversions
Ladder Method
T.
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KILO1000 HECTO
100 DEKA10
DECI0.1 CENTI
0.01 MILLI0.001
MetersLitersGrams
Ladder Method
1st – Determine your starting point.
2nd – Count the “jumps” to your ending point.
3rd – Move the decimal the same number of jumps in the same direction.
4 km = _________ m
12
3
How many jumps does it take?
Starting Point
Ending Point
4.1
__.2
__.3
__.
= 4000 m
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Try these conversions using the ladder method.1000 mg = _______ g 1 L = _______ mL160 cm = _______ mm 14 km = _______ m 109 g = _______ kg 250 m = _______ km
Conversion Practice
Compare using <, >, or =.
56 cm 6 m 7 g 698 mg
KILO1000 HECTO
100 DEKA10
DECI0.1 CENTI
0.01 MILLI0.001
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Write the correct abbreviation for each metric unit.
1) Kilogram _____ 4) Milliliter _____ 7) Kilometer _____
2) Meter _____ 5) Millimeter _____ 8) Centimeter _____
3) Gram _____ 6) Liter _____ 9) Milligram _____
10) 2000 mg = _______ g 15) 5 L = _______ mL 20) 16 cm = _______ mm
11) 104 km = _______ m 16) 198 g = _______ kg 21) 2500 m = _______ km
12) 480 cm = _____ m 17) 75 mL = _____ L 22) 65 g = _____ mg
13) 5.6 kg = _____ g 18) 50 cm = _____ m 23) 6.3 cm = _____ mm
14) 8 mm = _____ cm 19) 5.6 m = _____ cm 24) 120 mg = _____ g
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Write the correct abbreviation for each metric unit.
1) Kilogram _____ 4) Milliliter _____ 7) Kilometer _____
2) Meter _____ 5) Millimeter _____ 8) Centimeter _____
3) Gram _____ 6) Liter _____ 9) Milligram _____
10) 2000 mg = _______ g 15) 5 L = _______ mL 20) 16 cm = _______ mm
11) 104 km = _______ m 16) 198 g = _______ kg 21) 2500 m = _______ km
12) 480 cm = _____ m 17) 75 mL = _____ L 22) 65 g = _____ mg
13) 5.6 kg = _____ g 18) 50 cm = _____ m 23) 6.3 cm = _____ mm
14) 8 mm = _____ cm 19) 5.6 m = _____ cm 24) 120 mg = _____ g
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Compare using <, >, or =.
25) 63 cm 6 m 27) 5 g 508 mg
29) 1,500 mL 1.5 L
26) 536 cm 53.6 dm 28) 43 mg 5 g
30) 3.6 m 36 cm