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Understanding Density: Comparing Iron and Cork in Physics

This section explores the concept of density in matter, specifically comparing solids like iron and lighter materials such as cork. Density is defined as mass per volume, with examples of various materials, including gold, mercury, and water. A demonstration illustrates how a large bag of cork can weigh more than a small iron nail, although iron is denser. Additionally, the density of water, which is 1.0 g/cm³, is discussed, alongside ice's lower density of 0.92 g/cm³ and how temperature affects water density, influencing its behavior in different states.

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Understanding Density: Comparing Iron and Cork in Physics

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  1. Part II: Properties of Matter Chapter 12Solids (Just the section on “Density”) Physics 1 (Garcia) SJSU

  2. Small iron nail BIG BAG OF CORK Demo: Iron and Cork What is heavier, iron or cork? Depends on how much you have. A big bag of cork can weigh more than a small iron nail. Think of iron as being heavier because it is heavier for the same volume. Physics 1 (Garcia) SJSU

  3. Density Define density as mass per volume, ( Density ) = Densities ( in grams per cubic centimeter ): Gold: 19.3 Mercury: 13.6 Lead: 11.3 Iron: 7.9 Water: 1.0 Cork: 0.2 ( Mass ) ( Volume ) (See Table 12.1, page 232) Liquids Physics 1 (Garcia) SJSU

  4. Demo: Gold Brick Compute density of gold brick. Dimensions: (20.5 cm)x(10 cm)x(5 cm) Volume: 1025 cubic centimeters (= 1.025 liters) Mass: 11,600 grams (about 26 pounds) Density = (11,600) / (1025) = 11.3 g/cm3 Check with table that this is density of… Physics 1 (Garcia) SJSU

  5. Demo: Fool’s Gold Use displacement to find irregular volumes. Pyrite (called Fool’s Gold) is an iron ore (FeS2). Pyrite sample has: Mass: 61 g Volume: 12 cm3 Density =( 61 ) / ( 12 ) = 5.1 g/cm3 About a quarter the density of real gold. Physics 1 (Garcia) SJSU

  6. Check Yourself Water expands when it freezes into ice. Which has more volume, kilogram of ice or kg of water? Which has more mass, a kg of ice or a kg of water? Which has a higher density, water or ice (or the same)? Which has more mass, a liter of ice or a liter of water? Physics 1 (Garcia) SJSU

  7. Density drops on freezing Density of Water One liter of water (1000 cm3) has a mass of one kilogram (1000 grams) so density of water is 1.0 g/cm3. Density of water varies slightly with temperature, becoming less dense as temperature rises. Warm water rises and cold water sinks. Density of ice = 0.92 g/cm3 Physics 1 (Garcia) SJSU

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