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1 Measurement The Act of Measuring & The Metric System Dimensions, quantity, or capacity as ascertained by comparison with a standard

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2 What can we Measure? Length Volume Mass Temperature Time Meter Seconds Gram ºC (Celsius) Liter Force Newton

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3 The Metric System Prefixes Kilo____ = 1000 times Centi___ = 1/100 Mili____ = 1/1000 Suffixes ___meter (length) ___liter (volume) ___gram (mass) Based on multiples of 10!

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4 Scale: 0 10 system of ordered marks at fixed intervals used as a reference standard in measurement Intervals of 1

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5 What is the interval of this scale? Interval is….. 2 units 20 30

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6 And on this scale? Interval is….. 5 units 60 80 70 90

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7 MASS (g) How much matter does it contain? Measured with a Triple Beam Balance Milligrams, Grams, & Kilograms

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8 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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9 A balance is ready to use when it is zeroed out!

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10 300 30 + 3.4 ???.? Final Answer : 333.4g What’s the Mass?

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11 400 50 + 7.6 ???.? Final Answer : 457.6g What’s the Mass?

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12 203.6 g

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13 65.0 g

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14 Force (N) How much effort does it take? Measured with a spring scale Measured in Newton's

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15 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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16 3.4 N (What is the scale?)

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17 1.3 N (careful with the scale)

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18 14.4 N Scale is 0.4!!! 2.0 divided by 5 units = 0.4

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19 5.8 N

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20 How much force is required to pull the stool? 12.8 Newtons

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21 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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22 When measuring Length Remember 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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23 How long is the side? 5 cm

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24 4.2 cm or 42mm

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25 1.2 cm or 12 mm

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26 1.3 cm How many millimeters?… 13mm

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27 7 cm

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28 13.8cm or 138mm

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29 How wide is a CD? 52 mm or 5.2 cm

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30 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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31 42.2 ºC

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32 23.5 ºC

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33 22.3 ºC

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34 2.9 ºC

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35 -0.5 ºC

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36 Volume (L) How much space does it take up? Liquids measured with a Graduated Cylinder Milliliters & Liters

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37 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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38 88 mL (Scale is 2)

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39 36 mL

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40 25 mL

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41 54.5 mL

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42 Time (s) How long does it take? Measured with a stopwatch, clock, or calendar Time is universal; hours, minutes, & seconds

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43 The Metric System Prefixes Kilo____ = 1000 times Centi___ = 1/100 Mili____ = 1/1000 Suffixes ___meter (length) ___liter (volume) ___gram (mass) Based on multiples of 10!

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44 Let’s practice some measurement by doing a LAB in class!

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