# Density - Kyrene School District Density What is density? Density is a comparison of how much matter there is in a certain amount of space. Comparison of MASS per VOLUME Mass Amount of matter (atoms/molecules) in an object

Measured with a triple-beam balance, gravity scale, or digital scale Milligrams Grams Kilograms 300 g 60 g

5.7 g 365.7 g Total mass= ______ Volume Amount of space an object takes up How large the object is How much something can hold (capacity)

Measured by calculation or water displacement Volume by Calculation Any regular object has a formula that can be used to calculate its volume. Regular objects are shapes you have heard of, such as: Cubes, spheres, cylinders, cones,

pyramids. Write THIS formula: V= L x W x H Units are cubic cm3 in3 m3 Volume by Calculation V= L x Wx H

V = 5in x 4in x 3in V = 60(in x in x in) V = 60in3 Volume by Water Displacement Irregular objects do not have a formula to calculate their volume Use a method called Water Displacement Volume by Water Displacement

What is density? Density = mass OR volume Mass (g) Volume (cm3 or mL) mass volume. Units for density: g or g_

cm3 mL ALWAYS REMEMBER UNITS! Density Problems Together! Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its

density? D= m/v 9g / 3cm3 3 g/cm3 Frank also has an eraser. It has a mass of 2g, and a volume of 4mL. What is its density? D=m/v 2g/4ml

0.5 g/ml Work on these problems with your neighbor! Jack has a rock. The rock has a mass of 6g and a volume of 3cm3. What is the density of the rock? 6g / 3cm3 2 g/cm3 Jill has a gel pen. The gel pen has a mass

of 8g and a volume of 2mL. What is the density of the gel pen? 8g / 2mL 4g/mL Now, try these on your own. Alicia has a watch. It has a mass of 4g and a volume of 2mL. What is the density of the watch? 2 g/mL

Mia has a wallet. It has a mass of 15g and a volume of 5cm3. What is the density of the wallet? 3 g/cm3 Liquid Layers If you pour together liquids that dont mix and have different densities, they will form liquid layers.

The liquid with the highest density will be on the bottom. The liquid with the lowest density will be on the top. Liquid Layers Check out this picture from your book. 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? Liquid Layers Try with your neighbor

Which liquid has the highest density? Which liquid has the lowest density? Which liquid has the middle density? Liquid Layers Try on your own! Imagine that the liquids on the right

have the following densities: 15g/cm3 3g/cm3 7g/cm3 10g/cm3 9g/cm3 12g/cm3

Match the colors to the correct densities. 3g/cm3 7g/cm3 9g/cm3 10g/cm3 12g/cm3 15g/cm3

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