Density Are you dense How dense R U

Density Are you dense? ? (How dense R U? )

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

Mass, Volume & Density Mass - Amount of matter an object contains Volume - Amount of space an object occupies Density - A measure of how much matter is packed into a given volume l

Remember…………. l Density = Mass/Volume l Density of Water = 1 g/m. L (or cc) cubic cm. l If density is greater than water ------- Sink l If density is less than water ----- Float

Which one is more dense? l Demonstration: Kids in a square 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 cm 3 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? 9 g/ 3 cm 3 = 3 g/cm 3 l Frank also has an eraser. It has a mass of 3 g, and a volume of 1 cm 3. What is its density? 3 g/ 1 cm 3 = 3 g/cm 3

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?

What did we learn about density l Density is how much matter (stuff) there is in a certain amount of space. mass or mass ÷ volume l Density = volume l Units for density: g/cm 3 l Are you denser than water? ? ?

Liquid Layers l If you pour together liquids that don’t mix and have different densities, they will form liquid layers. l The liquid with the highest density will be on the bottom. l The liquid 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

Review l What is the formula for density? l What happens if you pour together liquids that have different densities? l Will the liquid on the top have the highest or lowest density? l Will the liquid on the bottom have the highest or lowest density?

Super Scientist Question of the Day l Jake has a book, a ruler, and a balance. l How can Jake find the density of the book with the tools he has?

Density Rap http: //www. educationalrap. com/song/weight-mass-volume-density. html