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Chapter 2:2 NOTESSI UnitsPages 50-54
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SI Units International
System of Units
Used worldwide
Established in 1960
Base Quantity
Unit Symbol
Length Meter m
Mass Kilogram kg
Time Second
Hour
s
h
temperature kelvin K
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Length
Length is measured with the SI base unit meter
Smaller items may be in centimeters EX: length of pencil
Larger objects measured in kilometers EX: length of a road trip
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Volume
The amount of space an object occupies The SI unit of volume is the cubic meter m3
V=LxWxH
V=3x4x2=24 m3
Liquid volume unit of measurement is liter (L)
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Volume by Immersion
Immersion – to immerse, or cover, in water Also called displacement Irregular shaped objects measured in cm3
How do you determine volume for an object that is not square or rectangle? EX: a rock
Let’s see how this is done 1 graduated cylinder 1 marble or rock water
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Mass and Weight
MassMass WeightWeight
Mass is the amount of matter in an object
Measurement of force of gravity
SI unit is Kilogram (g) SI unit is Newton (N)
Triple beam balance Spring scale
Stays the same no matter what the location
Will change on different planets due to gravitational force changes
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Temperature, Time, and Rate
Temperature is measured with the SI base unit Kelvin (K)
Time is measured with the SI base unit second (s) Also measured with the unit hour (h)
Rate is change over time ______ per ______ EX: miles per hour EX: breaths per second
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Metric Ladder Acronym
Kids Hear Dogs Barking During Crazy Movies
OROR
Kim’s Hungry Dad Buys Dark Chocolate Milk
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KILO1000Units
HECTO100
Units
DEKA10
UnitsDECI
0.1Unit
CENTI0.01Unit
MILLI0.001Unit
MetersLitersGrams
Ladder Method
How do you use the “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 = _______ mL 160 cm = _______ mm
14 km = _______ m 109 g = _______ kg 250 m = _______ km
Conversion Practice
Compare using <, >, or =.
56 cm 6 m 7 g 698 mg
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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 _____
Try these conversions, using the ladder method.
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
Metric Conversion Challenge
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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
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HOMEWORK
1. create your own metric ladder acronym 2.