Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
W H A T D E T E R M I N E S T H E D E N S I T Y O F A
S U B S T A N C E ?
DENSITY
Density Definition
 The amount of matter in a given volume
 “relative heaviness”
 Intensive property
 Density is const...
Density Calculation
 Osmium is a very dense metal. If a piece of osmium
has a mass of 50g and a volume of 2.22cm3, what i...
Solve for Mass or Volume
using the Formula Triangle
At the Molecular Level
Differences in density may help predict if an object sinks
or floats (along with other forces such as buoyancy)
Density of a Solid
 Mass: balance (grams)
 Volume: length x width x height= cm3
Phet Simulation Density of Cubes
Density of an Irregular Solid
 Mass: balance (grams)
 Volume: Liquid displacement- the solid displaces
(pushes away) a v...
Density of a Liquid
 Mass: balance (grams)
 Volume: pour into graduated cylinder (mL)
Applications
 Density & Oil Spills
 Oil (D= 0.85g/cm3) floats on the ocean surface (D=
1.02 g/cm3)
 Clean-up techniques...
Medical Uses
 Bone density scan (X-rays): Bone density is related
to bone strength, can diagnose osteoporosis, which
make...
Identification
 Diamond density is 3.5g/cm3, but Moissanite (a
diamond simulant) is 3.21g/cm3
Ocean Circulation Patterns
Life Support in Space!
 When sleeping, your warm
breath is pushed upward
and away from your face by
the cooler, more dens...
Rainbow Saltwater Density Straws: Mini-Lab
Source: Steve Spangler
Upcoming SlideShare
Loading in …5
×

Introduction to density

6,330 views

Published on

I made these slides for a HS Chemistry course within my properties of matter unit while discussing intensive properties. After the slides, we discussed density demos (underwater volcano, candles in water and isopropyl, and liquid displacement of a gummy bear). Then, all students did a mini-lab: rainbow saltwater density straws. Homework was a density problem set.

Published in: Education, Technology, Business
  • Be the first to comment

Introduction to density

  1. 1. W H A T D E T E R M I N E S T H E D E N S I T Y O F A S U B S T A N C E ? DENSITY
  2. 2. Density Definition  The amount of matter in a given volume  “relative heaviness”  Intensive property  Density is constant for all sample size of a given substance Mass units: grams or kilograms Volume units: mL, L, or cm3 (solids)
  3. 3. Density Calculation  Osmium is a very dense metal. If a piece of osmium has a mass of 50g and a volume of 2.22cm3, what is its density?
  4. 4. Solve for Mass or Volume using the Formula Triangle
  5. 5. At the Molecular Level
  6. 6. Differences in density may help predict if an object sinks or floats (along with other forces such as buoyancy)
  7. 7. Density of a Solid  Mass: balance (grams)  Volume: length x width x height= cm3 Phet Simulation Density of Cubes
  8. 8. Density of an Irregular Solid  Mass: balance (grams)  Volume: Liquid displacement- the solid displaces (pushes away) a volume of water
  9. 9. Density of a Liquid  Mass: balance (grams)  Volume: pour into graduated cylinder (mL)
  10. 10. Applications  Density & Oil Spills  Oil (D= 0.85g/cm3) floats on the ocean surface (D= 1.02 g/cm3)  Clean-up techniques: skimming- machines that suck up oil like a vacuum cleaner
  11. 11. Medical Uses  Bone density scan (X-rays): Bone density is related to bone strength, can diagnose osteoporosis, which makes bones more prone to breakage
  12. 12. Identification  Diamond density is 3.5g/cm3, but Moissanite (a diamond simulant) is 3.21g/cm3
  13. 13. Ocean Circulation Patterns
  14. 14. Life Support in Space!  When sleeping, your warm breath is pushed upward and away from your face by the cooler, more dense air in the room  In space, hot air does not rise in zero gravity conditions, so need air circulation in International Space Station
  15. 15. Rainbow Saltwater Density Straws: Mini-Lab Source: Steve Spangler

×