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Understanding Density: The Relationship Between Mass and Volume

Density is a key property of all materials, defined as mass per unit volume (D = m/v). While mass is measured in grams and volume in cm³ or liters, density reflects not only the weight of a substance but also how much space it occupies. This concept applies to solids, liquids, and gases, showing that a kilogram of feathers takes up more space than a kilogram of steel. By determining density through displacement of water, we explore specific gravity, which compares a material's density to that of water, offering insights into compactness and material behavior.

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Understanding Density: The Relationship Between Mass and Volume

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  1. DENSITY • Depends on: • Mass • Volume D = m/v (g/cm3) Mass usually expressed in grams Volume usually expressed in cm3 or liters, etc.

  2. What would take up more space??? A kilogram of feathers…..or a kilogram of steel?? OR

  3. The proximity of like atoms or molecules More than just the “heaviness” of a substance, density includes how much space an object takes up!! All substances have density including liquids, solids, and gases Density is the measure of the “compactness” of a material

  4. “Compactness”

  5. DETERMINING DENSITY • mass, then measure displacement of a liquid (usually water) by that irregularly shaped object

  6. Relative Density (Speific Gravity) • Instead of just speaking of density, we use a standardized label, specific gravity. • So we compare the density of a material vs. the density of water

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