Density What is density l Density is a

Density

What is density? l Density is a comparison of how much matter there is in a certain amount of space.

Which one is more dense? l How about this: Which square is more dense?

Which one is more dense? l Now which one is more dense?

What is density? l Density = mass OR volume mass ÷ volume. l Units for density: g or g cm 3 m. L l Why are these the units for density? ALWAYS REMEMBER UNITS! .

Let’s try a density problem together l Frank has a paper clip. It has a mass of 9 g and a volume of 3 cm 3. What is its density? l Frank also has an eraser. It has a mass of 3 g, and a volume of 1 cm 3. What is its density?

Work on these problems with your neighbor. l 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? l 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 rock?

Now, try these on your own. l Al’Licia has a watch. It has a mass of 4 g and a volume of 2 cm 3. What is the density of the watch? l Mia has a wallet. It has a mass of 15 g and a volume of 5 cm 3. What is the density of the wallet?

Density Columns l If you pour substances that don’t mix and have different densities, you will see one float to the top and the other sink to the bottom. l The fluid with the highest density will be on the bottom. l The fluid with the lowest density will be on the top.

Liquid Layers l Check out this picture from your book. Which layer has the highest density? l Which layer has the lowest density? l Imagine that the liquids have the following densities: ¡ 10 g/cm 3. ¡ 6 g/cm 3. 3 g/cm 3. 5 g/cm 3. l Which number would go with which layer?

Liquid Layers – Try with your neighbor l Which liquid has the highest density? l Which liquid has the lowest density? l Which liquid has the middle density?

Liquid Layers – Try on your own! l Imagine that the liquids on the right have the following densities: ¡ 15 g/cm 3 ¡ 3 g/cm 3 ¡ 7 g/cm 3 10 g/cm 3 9 g/cm 3 12 g/cm 3 l Match the colors to the correct densities. 3 g/cm 3 7 g/cm 3 9 g/cm 3 10 g/cm 3 12 g/cm 3 15 g/cm 3

Exit Ticket l 1. What is the formula for density? l 2. What happens if you pour together liquids that have different densities? l 3. Will the liquid on the top have the highest or lowest density? l 4. Will the liquid on the bottom have the highest or lowest density?

Exit Ticket l 5. Jake has a book, a ruler, and a balance. How can Jake find the density of the book with the tools he has?