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Density

Learning Target: Be able to explain how an object’s density is related to its mass and volume both mathematically (quantitatively) and in words (qualitatively). Density. m = 9kg V= 9m 2 P= 1kg/m2. m = 36kg V= 36m 2 P= 1kg/m2. m = 81kg V= 81m 2 P= 1kg/m2. m = 169 kg V= 169m 2

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Density

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  1. Learning Target: Be able to explain how an object’s density is related to its mass and volume both mathematically (quantitatively) and in words (qualitatively). Density m= 9kg V= 9m2 P= 1kg/m2 m= 36kg V= 36m2 P= 1kg/m2 m= 81kg V= 81m2 P= 1kg/m2 m= 169 kg V= 169m2 P= 1kg/m2

  2. Density (Qualitative) • An object’s density is related to the amount of matter or “stuff” (mass) contained in a corresponding unit of volume. • Density is a physical property of matter. • It is an Intensive property meaning density of a material does not change depending on the amount measured (see first slide).

  3. Density (Quantitative) • Density is a ratio (mass/volume) with SI dimensions [kg]/[m3] • For our class, we will mostly use units of g/cm3

  4. Densities of Some Common Substances In general, density decreases as a substance moves from solidliquidgas Do you notice any exceptions above?

  5. Relative Densitiesor“Will it Float?” • Density is related to buoyancy because objects less dense than another (i.e. water) will float. • To calculate a relative density, just divide the substance you are analyzing by a reference: pH2O= 1.00kg/m3 pIce= .917kg/m3 .917/1.00 = .917 If the substance is less than the reference (ratio is < 1) it will float.

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