Density: Warm Up Questions

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Density Warm Up Questions

• What is the meaning of population density?
• Which state do you think has the greatest
  population density?
• Which state do you think has the lowest
  population density?

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Lowest Population Density Wyoming!Estimate the
following on your sheet

• of people
• Area
• Population Density

530,000
97,818mi2
5.4 people/mi2
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Greatest Population Density New Jersey!
Yay!Estimate the following on your sheet

• of people
• Area
• Population Density

8,707,739
8,721 mi2

• 998 people/mi2

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Population Density the number of people living
in a particular area (people per square mile)
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(No Transcript)
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Mass Amount of matter in a substance measured
in grams with an electronic balance
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Volume Measure of the amount of spaceSolid
units cm3 Liquid/Gas units mL
Regular Objects - Measure and calculate

• Irregular Objects
• Water Displacement

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1 cm3 1 mL
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Density Definitions

• 1 Density Mass/Volume
• 2 Mass per unit volume
• 3 Mass of a known volume
• 4 Compactness
• 5 Units g/cm3
• 6 Mass of a 1 cm3 of a substance

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Definition 6 mass of 1 cm3 of a
substance
1 cm3
1 cm3
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Some known densities.
In one cubic centimeter of gold there is 19.3
grams of matter. In one cubic centimeter of lead
there is 11.4 grams of matter. In one milliliter
of air there is 0.001 grams of matter.
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Comparing Densities1 cm3 of concrete vs. 1 cm3
of air?

• Which has more mass?
• 2. Which has a greater volume?
• 3. Which has a greater density?

Concrete
They have the same volume
Concrete
Explain your reasoning for your answers.
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Which do you think has a greater mass?Which do
you think has a greater volume?Which do you
think has a greater density?
(Write these answers next to the previous answers
for 9-11)
Lead block
Wood Shavings
Lead block
Pb
Lead Block
Wood Shavings
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• Assume each box has a volume 1 cm3Assume each
  red ball is equal to 1 g of matter
• Calculate the density of each objectshow your
  calculations
• Substance A Substance B

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One of densest substances?Gold 19.3g/cm3
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Densest known substanceLeast Dense Known
Substance
Osmium22.57g/cm3
Hydrogen 0.000089g/mL
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Floating and SinkingDensity of Air 0.0013 g/cm3
Density of Tank ???
Density of Helium 0.00018 g/cm3
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Density of Pure Water 1.0 g/cm3Density of a
person less than that ?