1. Density DensityDensity is how much mass something has in a certain volume 100kg 200kg Which block has more matter in it? The blue block must have a higher density! How can one have more matter if they are the same size?

2. more matter same volume yellow matter must be more dense The yellow block has more matter contained in the same volume as the blue block. Therefore, the yellow matter must be more dense. Which block has higher density? How do you know?

3. Which block has higher density? same density If it is the same type of matter, then it has the same density because the matter is equally crowded. The size of the piece does not make a difference.

4. Which block is more dense? The pink block is smaller, but it still has a higher density, because the matter is more crowded.

5. You can use density to predict if an object will float or sink. If something is more dense than the fluid, sink it will sink. Will the yellow object float or sink?

6. If something is less dense than the fluid, float it will float. Will the brown block float or sink?

7. The duck is less dense less dense than water so it floats The anchor is more dense more dense than water so it sinks

8. How can a balloon float just by filling it with hot air?

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11. Inside balloon Outside balloon When a fluid gets hot, its density changes!

12. The formula for calculating density is: Density = Mass Volume How can you figure out the density of an object? massvolume You need to measure the mass and the volume.

13. m v d DMV Triangle: Cover the variable that you need to find, the triangle will tell you what math to do to find it.

14. Remember how to measure mass? Remember how to measure mass? amount of matterMass is a measurement of the amount of matter that something has. gramThe SI unit for mass is the gram. balanceMass is measured with a balance. Balance

15. Remember how to measure volume? amount of space that something takes upVolume is the amount of space that something takes up Volume is measured differently for liquids and solids Volume of Liquids liter The SI unit for liquid is liter graduated Liquid volume is measured with a graduated cylinder cylinder

16. Rectangular Solids Length Height Width 1.6cm x1.3cm x4.1cm = 8.528 cm 3 cm xx = cm 3 8.5 cm 3

17. Displacement method Irregular Solids 65 mL 69 mL Volume of Hammer? 4 mL or 4 cm 3 Because the hammer is solid, we use cm 3 !

18. Calculating density is simple! mass 1. Measure the mass. volume 2. Measure the volume. Divide 3. Divide. Mass (grams) Volume (cm 3 ) Density = grams/cm 3 The units that we use for density are grams/cm 3 Say “per”

19. Density Problems (Use the DMV triangle!) 1. If 52 grams of matter has a volume of 65 cm 3, what is the density of the matter? Will it float or sink in water? 2.If a 32 gram piece of wood has a density of 4 g/cm 3, what is the volume? 3.A metal washer has a mass of 27 g/cm 3 and a volume of 3 cm 3. What is its mass?

20. 4.If an object has a mass of 810 g and a volume of 45 cm 3, what is its density? Will it float or sink in water? 5.When you add a rock to 70 mL of water in a graduated cylinder, the water rises to 80 mL. The density of the rock is 4.2 g/cm 3. What is the rock's mass? 6.What is the volume of a sample of liquid with a density of 20 g/cm 3 and a mass of 25 g? 7.A 540g fish displaces 90 cm 3 of water. What is the density of the fish?