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MeasurementThe Act of Measuring
&The Metric System
Dimensions, quantity, or capacity as ascertained by comparison with a
standard
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What can we Measure?
Length
Volume
Mass
Temperature
TimeMeter Seconds
Gram
ºC (Celsius)
LiterForceNewton
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The Metric System
PrefixesKilo____ = 1000 times
Centi___ = 1/100
Mili____ = 1/1000
Suffixes___meter (length)
___liter (volume)
___gram (mass)
Based on multiples of 10!
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Scale:0
10
system of ordered marks at fixed intervals used as a reference standard in measurement
Intervals of 1
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What is the interval of this scale?
Interval is…..
2units
20
30
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And on this scale?
Interval is…..
5units
60
80
70
90
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MASS (g)How much matter does it
contain?
Measured with a Triple Beam Balance
Milligrams, Grams, & Kilograms
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Tips on using the Triple Beam Balance
•Move the 100s first, then 10s, then 1s.•Make sure the 100s and 10s slider is in a grove.
•Use the tip of a pen or pencil to move the small 1s slider.
•Last make sure the lines are even!
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A balance is ready to use when it is zeroed out!
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300 30 + 3.4 ???.?
Final Answer: 333.4g
What’s the Mass?
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400 50 + 7.6 ???.? Final Answer: 457.6g
What’s the Mass?
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12203.6 g
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1365.0 g
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Force (N)How much effort does it
take?
Measured with a spring scale
Measured in Newton's
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Like the Triple beam balance, make sure the spring scale reads
zero before you use it!!
Too High!!!
Too Low!!!
JUST RIGHT!!
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3.4 N
(What is the scale?)
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1.3 N
(careful with the
scale)
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14.4 N
Scale is 0.4!!!2.0 divided by 5 units =
0.4
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5.8 N
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How much force is required to pull the stool?
12.8 Newtons
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Length & Distance (m)How long is it?
How far is it?
Measured with a ruler or meter stick.
Millimeter Centimeter, & Kilometer
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When measuring LengthRemember to:• Make sure you know the units
of your ruler or measuring instrument.
• Identify the scale• Line up the object up at the
zero mark
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23How long is the side?
5 cm
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4.2 cm or 42mm
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1.2 cm or 12 mm
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1.3 cmHow many millimeters?…13mm
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7 cm
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13.8cm or 138mm
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How wide is a CD?
52 mm or 5.2 cm
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Temperature (ºC)How Hot or Cold is
Something?
Measured with a thermometer
Water freezes at 0º C & boils at 100º C
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42.2 ºC
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23.5 ºC
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22.3 ºC
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2.9 ºC
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-0.5 ºC
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Volume (L)How much space does it
take up?
Liquids measured with a Graduated Cylinder
Milliliters & Liters
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When we measure volume we read the bottom of the meniscus!
Not Here
Here, at the bottom of the meniscus!
33 mL. Not 34!
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3888 mL (Scale is 2)
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36 mL
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25 mL
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54.5 mL
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Time (s)How long does it take?
Measured with a stopwatch, clock, or calendar
Time is universal; hours, minutes, & seconds
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The Metric System
PrefixesKilo____ = 1000 times
Centi___ = 1/100
Mili____ = 1/1000
Suffixes___meter (length)
___liter (volume)
___gram (mass)
Based on multiples of 10!
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Let’s practice some measurement by doing a LAB in
class!