Will it Float or Sink? Density.

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Presentation transcript:

Will it Float or Sink? Density

Density

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

The formula of density is: Density = Mass / Volume

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

Density Units of Density

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

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

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

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

Densities of Common Substances Density Densities of Common Substances

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

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

Densities of Some Common Substances Figure 6: Applying Concepts: How could you use density to determine whether a bar of metal is pure gold? Densities of Some Common Substances Substance Density (g/cm³) Air 0.001 Ice 0.9 Water 1.0 Aluminum 2.7 Gold 19.3 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.

 Reading Checkpoint Will an object with a density of 0  Reading Checkpoint 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