Aim: How do we calculate density?

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# Aim: How do we calculate density? - PowerPoint PPT Presentation

Aim: How do we calculate density?. Do Now: Convert the following metric units 564 L = ____ mL 600 Hg = ____ dg 1.23 g = ____ cg 1.3 Dm = ____ Km .02 KL = ____ mL 99 dm = ____ Dm Homework: Study for metric quiz. Introduction to Density. What is density?.

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Presentation Transcript
Aim: How do we calculate density?

Do Now: Convert the following metric units

564 L = ____ mL 600 Hg = ____ dg

1.23 g = ____ cg 1.3 Dm = ____ Km

.02 KL = ____ mL 99 dm = ____ Dm

Homework: Study for metric quiz

### Introduction to Density

What is density?
• Density is a specific property of matter that is related to the mass divided by the volume
What is the formula for density?
• D = _Mass_

Volume

• D = M

V

• D = Density
• M = Mass
• V = Volume

M

D

V

Why does a penny sink in water?
• Pennies are more dense than water, therefore they sink
Why does ice float in water?
• Ice cubes are less dense than water, therefore they float
How will an egg float in water?
• Egg in fresh water
• The egg will sink because it is more dense than the fresh water
How will an egg float in water?
• Egg in salt water
• The egg will float because it is less dense than the salt water
How will an egg float in water?
• Egg in fresh and salt water
• The egg will be suspended in the middle because it is the same density as the water mixture

### Work on the Density Calculations

How Do We Calculate Density in 3 Easy Steps?
• Step 1
• Calculate the mass of your object using the triple-beam balance
How Do We Calculate Density in 3 Easy Steps?
• Step 2
• Calculate the volume
• Measure the length, width and height and use the volume formula
• Use the graduated cylinder for liquids or irregular solids
How Do We Calculate Density in 3 Easy Steps?
• Step 3
• Use the density formula

D = _Mass_

Volume

Summary
• What is density?
• Is Ice more or less dense than water? Why?
• Name an item that is more dense than water.
• Why does an egg float in salt water?
• How can we calculate the density of common items?