A fluid is any form of matter that can flow.

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Presentation transcript:

A fluid is any form of matter that can flow. 7.2 Fluids and Density A fluid is any form of matter that can flow. Liquids and gases are fluids since they do not have a fixed shape. Solids are not fluids. Lava, water, and syrup are examples of fluids. See page 260

Solid, Liquid, and Gas Density Density is the amount of mass for each unit of volume. Density describes how closely packed together the particles are in a material. Describe the spacing of the particles in the solid block, liquid water, and gaseous air. Most substances are denser in their solid form than in their liquid form, but water is an exception. See page 261

Fluids that do not mix, layer themselves according to their density. Layers of Fluids Fluids that do not mix, layer themselves according to their density. Less dense fluids “float” on top of more dense fluids. oil Can you list the objects, in this beaker, from most dense to least dense? ball water See pages 262 - 263

Both mass and volume are required when calculating density. Mass: Measuring Density Both mass and volume are required when calculating density. Mass: Mass can be measured using a scale or balance. Volume: For objects that are block shaped, volume can be calculated by measuring the block and then using the equation: volume = length x width x height. For objects with irregular shape displacement is the method used to find the volume. balance See page 264

Density can be calculated using the following formula: Calculating Density Density can be calculated using the following formula: Answer the following: What is the density of a 4 cm3 rock that has a mass of 24 g? A 5 ml sample of motor oil has a mass of 4.5 g. What is the density of the motor oil? See page 265 See next slide for the answers.

Density can be calculated using the following formula: Calculating Density Density can be calculated using the following formula: Answer the following: What is the density of a 4 cm3 rock that has a mass of 24 g? A 5 ml sample of motor oil has a mass of 4.5 g. What is the density of the motor oil? Answers 6 g/cm3 0.9 g/mL See page 265