DENSITY Density is a central concept in chemistry and physical science.

Why is DENSITY Important? Lava lamps Floating boats Hot Air Balloon

Why is DENSITY Important? Density is a principle that is involved in many of Earth’s processes: •Water Cycle • Ocean currents and circulations • Plate tectonics • Weather (atmospheric temperature and pressure),…. Density help scientists to identify minerals and rocks.

What is Density? •Density is the measurement of the compactness of an object. Which is more dense a cube of wood or a cube of metal? •As long as an object is made up of molecules, and thus has size, it has a density. (Solid, Liquid, Gas) •The density of a substance is the relationship between the mass of the substance and how much space it takes up (volume).

How Can I Calculate Density? Density is defined by the ratio of the mass of a substance to its volume. Mass- The amount of matter (stuff) in an object. Units = grams (g)

How can I calculate density? Density is defined by the ratio of the mass of a substance to its volume. Volume- the amount of space that an object takes up Units = centimeters cubed (cm3)

How can I calculate density? Density is defined by the ratio of the mass of a substance to its volume. Mass- The amount of matter (stuff) in an object. Units = grams (g) Volume- the amount of space that an object takes up •Units = centimeters cubed (cm3) Density-the amount of matter in a certain amount of space. •Units = g/cm3

ALWAYS SHOW YOUR WORK AND REMEMBER UNITS! How can I calculate density? Density equals the mass of the substance divided by its volume. 𝐷𝑒𝑛𝑠𝑖𝑡𝑦= 𝑀𝑎𝑠𝑠 𝑉𝑜𝑙𝑢𝑚𝑒 𝐷= 𝑀 𝑉 Density equation:   Units = g/cm3 ALWAYS SHOW YOUR WORK AND REMEMBER UNITS! https://www.youtube.com/watch?v=FSupQZQqaPk

Which one is more dense? How about this: Which square is more dense? Objects with the same volume but different mass

Which one is more dense? Now which square is more dense? a. b. Objects with the same mass but different Volume

A. D= 𝑽𝒐𝒍𝒖𝒎𝒆 𝑴𝒂𝒔𝒔 B. 𝑫= 𝑴𝒂𝒔𝒔 𝑨𝒓𝒆𝒂 C. 𝑫= 𝑴𝒂𝒔𝒔 𝑽𝒐𝒍𝒖𝒎𝒆 What is the equation of density? A. D= 𝑽𝒐𝒍𝒖𝒎𝒆 𝑴𝒂𝒔𝒔 B. 𝑫= 𝑴𝒂𝒔𝒔 𝑨𝒓𝒆𝒂 C. 𝑫= 𝑴𝒂𝒔𝒔 𝑽𝒐𝒍𝒖𝒎𝒆

Let’s try a density problem together Jonathan has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its density? Mia has an eraser. It has a mass of 3g, and a volume of 1cm3. What is its density? Mass= 9 g Volume= 3 cm3 Density = ? Mass= 3 g Volume= 1 cm3 Density = ?

Work on these problems with your neighbor. Jared has a rock. The rock has a mass of 6g and a volume of 3cm3. What is the density of the rock? Annika has a gel pen. The gel pen has a mass of 8g and a volume of 2cm3. What is the density of the pen? 9 g 2 cm3 2 g/cm3 0.25 g/cm3 4 g/cm3 4 g/cm2

Now, try these on your own. Ariel has a watch. It has a mass of 4g and a volume of 2cm3. What is the density of the watch? Avery has a wallet. It has a mass of 15g and a volume of 5cm3. What is the density of the wallet?

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

Liquid Layers If you pour together liquids that don’t 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. https://www.youtube.com/watch?v=dcQR6vV1Sqo

Check out the layer density jar. Which layer has the highest density? Liquid Layers Check out the layer density jar. Which layer has the highest density? Which layer has the lowest density? Imagine that the liquids have the following densities: A) 10g/cm3 B) 3g/cm3 C) 6g/cm3 D) 5g/cm3 Which number would go with which layer?

Six layers of density!!!! Rubbing alcohol 0.79 g/cm3 Vegetable oil 0.80 g/cm3 Water is 1 g/cm3 Milk 1.03 g/cm3 Dawny dish soap 1.06 g/cm3 Maple syrup 1.37 g/cm3

Why do Icebergs float? When water freezes, the molecules crystallize, with the space between each molecule increasing. If the mass of water does not change, this has the effect of decreasing the density of frozen water. It is for this reason that ice floats on top of water, as seen in the frozen surfaces of lakes and in icebergs.