measuring matter. matter anything that has mass and takes up space
TRANSCRIPT
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Measuring Matter
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Matter• Anything that has mass and takes up space
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Mass•The amount of matter in an
object•Measured in grams or
kilograms•Measured by a triple beam
balance
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How is mass different from
weight?• Weight can change, mass doesn’t• For example, you weigh less
underwater than you do on land. But your mass stays the same.
• What happens to your weight when you go into space??
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Using a Triple Beam Balance
• Place an object on the left side of the balance.
• Move the three different weights until the lines on the right match
• Add the three weights together
What mass is shown here?373.5 grams
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Units of Measurement• Volume of Regular Object =
– cm³ (cubic centimeter)–m ³ (cubic meter)
• Volume of Irregular Object= –mL (mililiter)– L (liter)
• Mass=– g (gram) – kg (kilogram)
•Density=-g/mL-g/ cm³
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Volume•The amount of space matter occupies
•How to find the volume of a regular object:
length x width x height
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Your Turn
↕ 35cm ⃡
• What is the volume of this cereal box?⃡
3850 cm³
22 cm
5 cm
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Volume of an Irregular Object
• Fill a graduated cylinder with water
• Measure the water level• Place the object into the water• Measure the water level now• New water level
-Old water level
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Your Turn• What is the water
level at first? 32 mL
• What is the new water level?
38 mL
38-32=6mL
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• What is the water level at first?
30 mL• What is the
new water level?
40 mL
40-30=10 mL
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Density•How much matter there is in a certain
amount of space
Density=mass/volume•Which square is more dense?
3 cm 3 cm
Mass- 5 g Mass- 20 g
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Density
Volume= 3x3x3
27 cm ³3 cm 3 cm
Volume= 3x3x3
27 cm ³Mass=5 gDensity=5/27
0.18 g/cm³
Mass=20 gDensity=20/27
0.74 g/cm³
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Your Turn• George has a watch. It has a mass of
16g and a volume of 4mL. What is its density?
4 g/mL
• Joshua has a wallet. It has a mass of 20g, and a volume of 4 mL. What is its density?
5 g/mL
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• Melissa has a book. It has a mass of 275g and a volume of 588cm3. What is its density?
0.46 g/cm³
• Melissa also has a notebook. It has a mass of 279g, and a volume of 456 cm3. What is its density?
Your Turn
0.61 g/cm³