What is density Density is a comparison of

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What is density? Density is a comparison of how much matter there is in

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

Which one is more dense?

Which one is more dense?

Now which one is more dense?

Now which one is more dense?

What is density? The amount of mass in a given volume.

What is density? The amount of mass in a given volume.

The Formula For Density • Density = mass OR volume mass ÷ volume.

The Formula For Density • Density = mass OR volume mass ÷ volume.

Units for density: g cm 3 Why are these the units for density? ALWAYS

Units for density: g cm 3 Why are these the units for density? ALWAYS REMEMBER UNITS!

Let’s try a density problem together. Frank has a paper clip. It has a

Let’s try a density problem together. Frank has a paper clip. It has a mass of 9 g and a volume of 3 cm 3. What is its density? On your table try and find the density. • Density = mass volume OR mass ÷ volume.

Frank has a paper clip. It has a mass of 9 g and a

Frank has a paper clip. It has a mass of 9 g and a volume of 3 cm 3. What is its density? • Density = mass OR mass ÷ volume Density = 9 g ÷ 3 cm 3 = 3 g/cm 3

Frank also has an eraser. It has a mass of 3 g and a

Frank also has an eraser. It has a mass of 3 g and a volume of 1 cm 3. What is its density? • Density = mass OR mass ÷ volume

Answer Frank also has an eraser. It has a mass of 3 g and

Answer Frank also has an eraser. It has a mass of 3 g and a volume of 1 cm 3. What is its density? • Density = mass OR volume 3 ÷ 1=3 g/cm 3 mass ÷ volume.

Work on these problems with your neighbor. 1. ) Jack has a rock. The

Work on these problems with your neighbor. 1. ) 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? 2. ) 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?

Answer 1. Jack has a rock. The rock has a mass of 6 g

Answer 1. 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? • Density = mass OR volume 6 ÷ 3= 2 g/cm 3 mass ÷ volume.

Answer 2. Jill has a gel pen. The gel pen has a mass of

Answer 2. 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? • Density = mass OR volume 8 ÷ 2=4 g/cm 3 mass ÷ volume.

Now, try these on your own. 3. ) Al’Licia has a watch. It has

Now, try these on your own. 3. ) 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? 4. ) 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?

Answers 3. 4. • mass ÷ volume. 4 ÷ 2=2 g/cm 3 15 ÷

Answers 3. 4. • mass ÷ volume. 4 ÷ 2=2 g/cm 3 15 ÷ 5=3 g/cm 3

Liquid Layers • Check out this picture. Which layer has the highest density? •

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

3 g/cm 3 5 g/cm 3 6 g/cm 3 10 g/cm 3

3 g/cm 3 5 g/cm 3 6 g/cm 3 10 g/cm 3

Liquid Layers – Try with your neighbor • Which liquid has the highest density?

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

 • Which liquid has the highest density? Golden Syrup • Which liquid has

• Which liquid has the highest density? Golden Syrup • Which liquid has the lowest density? Oil • Which liquid has the middle density? Water

Measuring the Volume by Displacement of Water 1. Take the initial reading (without the

Measuring the Volume by Displacement of Water 1. Take the initial reading (without the object). 2. Place the object in the cylinder. 3. Take the final reading. 4. Subtract the original amount from the final amount.

Mistakes

Mistakes

Try this with your partner. 1. Take the initial reading (without the object). 2.

Try this with your partner. 1. Take the initial reading (without the object). 2. Place the object in the cylinder. 3. Take the final reading. 4. Subtract the original amount from the final amount.

Original volume = 200 cm 3 Final volume = 260 cm 3 260 cm

Original volume = 200 cm 3 Final volume = 260 cm 3 260 cm 3 - 200 cm 3 = 60 cm 3 Object volume = 60 cm 3

What is the volume of the Toy Dinosaur?

What is the volume of the Toy Dinosaur?

Original volume = 4. 8 cm 3 Final volume = 5. 6 cm 3

Original volume = 4. 8 cm 3 Final volume = 5. 6 cm 3 5. 6 cm 3 – 4. 8 cm 3 =. 8 cm 3 Object volume =. 8 cm 3