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Measurement-A Common Language Density

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The measure of how much mass is contained in a given volume

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The formula of density is: Density = Mass / Volume

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Figure 5: Comparing Densities - Inferring: Which item has the greater density? The bowling ball Since the bowling bowl has a greater mass, it has a greater density, even though both balls have the same volume

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Density Units of Density

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Why is density expressed as a combination of two different units? Because density is actually made up of two other measurements – mass and volume – an objects density is expressed as a combination of two units

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Two Common Units For Density Grams per cubic centimeter (g/cm³) Grams per milliliter (g/mL)

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Math Practice: What is the density of a wood block with a volume of 125 cm³ and a mass of 57 g? Density = mass / volume Density = 57 g / 125 cm³ Density = 0.46 g/ cm³

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Math Practice: What is the density of a liquid with a mass of 45 g and a volume of 48 mL? Density = mass / volume Density = 45 g / 48 mL Density = 0.94 g/mL

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Density Densities of Common Substances

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The density of a substance is the ______for all samples of that substance. Same

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An object will float if it is _____ _____ than a surrounding liquid. Less dense

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Figure 6: Applying Concepts: How could you use density to determine whether a bar of metal is pure gold? If the bar of gold has a density that is greater than or less than 19.3 g/cm³, then the sample is not pure gold. Densities of Some Common Substances SubstanceDensity (g/cm³) Air0.001 Ice0.9 Water1.0 Aluminum2.7 Gold19.3

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Reading Checkpoint (page 53): Will an object with a density of 0.7 g/cm³ float or sink in water? An object that has a density of 0.7 g/cm³ will float in water (1 g/cm³) because it is less dense than water

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