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DENSITYDENSITY
A Quantitative Physical PropertyA Quantitative Physical Property
Which Weighs More??
A Pound of Lead
-or-
A Pound of Feathers
If You’re Stumped…
You’re Thinking
About
DENSITY
DENSITY
A measurement of the quantity of mass
per unit of volume
Density
Is an Intensive
Property…
It is NOT dependent on the amount of a substance present
Density
Is a useful tool for identifying pure
substances
Each substance has a unique density value
The Formula:
Density=mass
volume
Units of Density
g
cm3
Generally expressed as grams per
milliliter
(or grams per
cm3)
g
mL
To Measure Mass:
Use a
Balance
To Measure Volume
Use a formula
(for regular objects)
L x W x H
for a cube
What about Irregular Objects?
Use
“Water Displacement”
Technique:
Use a Graduated Cylinder
Subtract initial volume from final volume
Practice Problems (POC):
Complete problems
1, 2, 3, and 4
on Density Handout Sheet
Use dimensional analysis and sig figs
(we’ll go over the answers)
