Density What is Density Density is the amount

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Density

Density

What is Density? • Density is the amount of mass in a volume Or

What is Density? • Density is the amount of mass in a volume Or a comparison of how much matter there is in a certain amount of space. • It also determines whether something will float or sink in water • It can be calculated using the following formula: Density = Mass ÷ Volume

Units for Density Based on the formula for calculating density, what do you think

Units for Density Based on the formula for calculating density, what do you think are the units for density? Density = Mass ÷ Volume Units for Mass ÷ Units for Volume g ÷ m. L or cm 3 g/cm 3 or g/m. L

What is Density? Density the amount of mass in a volume Units Instrument used

What is Density? Density the amount of mass in a volume Units Instrument used g/m. L g/cm 3 balance and graduated cylinder or ruler Density = Mass ÷ Volume

We are going to practice Density as a class. Let’s see how dense we

We are going to practice Density as a class. Let’s see how dense we can get! • Frank has a paper clip. It has a mass of 9 g and a volume of 3 cm 3. What is its density? Let’s do an example. • Frank also has an eraser. It has a mass of 3 g, and a volume of 1 cm 3. What is its density?

Work through these problems with a neighbor • Jack has a rock. The rock

Work through these problems with a neighbor • Jack has a rock. The rock has a mass of 6 g and a volume of 3 cm 3. What is the density of the rock? Let’s do an example. • Jill has a gel pen. The gel pen has a mass of 8 g and a volume of 2 cm 3. What is the density of the gel pen?

Density = Mass ÷ Volume • Density is a physical property of matter that

Density = Mass ÷ Volume • Density is a physical property of matter that is always the same at a given temperature and pressure for a given substance

Applying Concepts: How could you use density to determine whether a bar of metal

Applying Concepts: How could you use density to determine whether a bar of metal is pure gold? • If the bar of gold has a density that is greater than or less than 19. 3 g/cm³, then the sample is not pure gold. Densities of Some Common Substances Substance Density (g/cm³) Air 0. 001 Ice 0. 9 Water 1. 0 Aluminum 2. 7 Gold 19. 3

Effects of Mass and Volume on Density

Effects of Mass and Volume on Density

Density = Mass ÷ Volume Which one is more dense? People in a square

Density = Mass ÷ Volume Which one is more dense? People in a square Why?

Density = Mass ÷ Volume Now which one is more dense? Why?

Density = Mass ÷ Volume Now which one is more dense? Why?

What happens to the density when the mass of an object increases? Density increases

What happens to the density when the mass of an object increases? Density increases M = D What happens to the density when the volume of an object increases? Density decreases V = D

Packed with sand Packed with cotton M = D

Packed with sand Packed with cotton M = D

Explain the following in terms of mass, volume, and density. When Mass stays the

Explain the following in terms of mass, volume, and density. When Mass stays the same: V = D

Gummy Bear Density Lab What happens to the density of a gummy when left

Gummy Bear Density Lab What happens to the density of a gummy when left in water overnight? Why?

Density and Floating

Density and Floating

An object will float if it is _____ than a surrounding liquid. More or

An object will float if it is _____ than a surrounding liquid. More or Less dense? ? LESS DENSE!!!!

Will an object with a density of 0. 7 g/cm³ float or sink in

Will an object with a density of 0. 7 g/cm³ float or sink in water? • An object that has a density of 0. 7 g/cm³ will float in water (1 g/cm³) because it is less dense than water

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