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# Volume and Density

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1. Volume and Density

2. Volume (Capacity) • Volume is the amount of space taken up by an object • Volume can also mean how much something holds • Volume can be measured in many different units • Volume can be calculated by using water displacement!

3. Units for Measuring Volume Metric Standard • Liter (l) • Milliliter (ml) • Cubic Centimeter (cc or cm3) **Remember: 1 ml = 1 cc Other Standards • Gallon (gal.) • Quart (qt.) • Pint (pt.) • Cup (c.) • Tablespoon (tbsp.) • Teaspoon (tsp.) • Fluid Ounce (fl. oz.) • Cubic Inches (in3or cu in.) • Cubic Feet (ft3or cu. ft.)

4. Using Water Displacement to Calculate Volume • Measure the level of the water in a container. 70 ml 60 ml 50 ml 40 ml 30 ml 20 ml 10 ml

5. Using Water Displacement to Calculate Volume • Measure the level of the water in a container. 30.0 ml 70 ml 60 ml 50 ml 40 ml 30 ml 20 ml 10 ml

6. Using Water Displacement to Calculate Volume • Measure the level of the water in a container. 30.0 ml • Insert an object in the water. We’ll use a metal ball. 70 ml 60 ml 50 ml 40 ml 30 ml 20 ml 10 ml

7. Using Water Displacement to Calculate Volume • Measure the level of the water in a container. 30.0 ml • Insert an object in the water. We’ll use a metal ball. • Measure the level after the ball has displaced some of the water. 70 ml 60 ml 50 ml 40 ml 30 ml 20 ml 10 ml

8. Using Water Displacement to Calculate Volume • Measure the level of the water in a container. 30.0 ml • Insert an object in the water. We’ll use a metal ball. • Measure the level after the ball has displaced some of the water. 39.0 ml 70 ml 60 ml 50 ml 40 ml 30 ml 20 ml 10 ml

9. Using Water Displacement to Calculate Volume • Measure the level of the water in a container. 30 ml • Insert an object in the water. We’ll use a metal ball. • Measure the level after the ball has displaced some of the water. 39 ml • Finally, find the difference between the water level before displacement and after displacement. 39.0 minus 30.0 = 9.0 ml 70 ml 60 ml 50 ml 40 ml 30 ml 20 ml 10 ml

10. Using Water Displacement to Calculate Volume The metal ball has a volume of 9.0 ml! 70 ml 60 ml 50 ml 40 ml 30 ml 20 ml 10 ml

11. M ÷ ÷ DXV Density • Density refers to “how crowded” the particles in an object are! • Density can be measured in grams per milliliter (g/ml)

12. How to Calculate Density • Find the volume of the object. You can use water displacement for this or traditional formulas (L x W x H). Let’s use the metal ball again. It’s volume was 9.0 ml! • Now find the mass of the object. You can use a scale for this. . Mass = 54.0 g • Divide the mass by the volume! 54.0 g ÷ 9.0 ml = 6.0 g/ml

13. More About Density . . . • Pure water has a density of 1.00 g/ml • If any material is denser than the fluid that surrounds it, it will ___________ • If any material is less dense than the fluid that surrounds it, It will __________!

14. SINK or FLOAT In Water (D = 1.0 g/mL) Density Table Float Float Float Sink Sink Sink Float (alcohol) Float (fuel)

15. 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: • 10g/cm3. 3g/cm3. • 6g/cm3. 5g/cm3. • Which number would go with which layer?

16. Liquid Layers – Try on your own! • Imagine that the liquids on the right have the following densities: • 15g/cm3 10g/cm3 • 3g/cm3 9g/cm3 • 7g/cm3 12g/cm3 • Match the colors to the correct densities. 3g/cm3 7g/cm3 9g/cm3 10g/cm3 12g/cm3 15g/cm3