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Density

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Definition Density: The amount of matter in a certain volume. (How much matter is in a given amount of space.) Example: Each of the spheres in these boxes have the same mass, which box has a higher density?

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Calculations There is only one equation for density calculations: D = m / v Density = mass / volume

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Calculations Mass is mass, but sometimes, calculating volume can be trickier.

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Measuring Volume

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What is Volume? Volume is the amount of space something occupies. Everything has volume. Everything takes up space.

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Know Your Equipment There are two pieces of lab equipment that you will use to measure volume. 1. Graduated Cylinder 2. Meter Stick

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Know Your Equipment Graduated cylinders are used to measure liquid volume as well as the volume of irregular objects.

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Know Your Equipment Read measurements based on the bottom of the meniscus.

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Know Your Equipment What is the volume of this graduated cylinder?

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Know Your Equipment To calculate the volume of an irregular object, use the following steps: 1.Calculate volume without object. 2.Calculate volume with object. 3.Subtract the values to find the volume of the object.

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Know Your Equipment So, what is the volume of the action figure?

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Know Your Equipment A meter stick is used to measure geometric volume. The formula for rectangular prism or cube volume is: Length x Width x Height 10 cm 9 cm 8 cm

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Know Your Equipment What is the volume of this cube? The formula for rectangular prism or cube volume is: Length x Width x Height 10 cm 9 cm 8 cm

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Density and Water Water has a density of 1 g/cm 3 (or 1 g/mL). This means that a cube of water exactly 1cm 3 large would have a mass of exactly 1 gram. Think About It: What would have a higher density: Distilled water or salt water? Why?

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Density and Water Density of Object > 1 g/cm 3 = Sinks in Water Density of Object < 1 g/cm 3 = Floats on Water

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