Density


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DENSITY

Text Box: DENSITY

MAIN IDEAS                               PRACTICE

WHAT IS DENSITY?


  • A material's density is defined as its mass per unit volume.


  • a measurement of how tightly matter is packed together

WHAT WILL HAPPEN TO AN OBJECT PLACED IN WATER IF THE OBJECT’S DENSITY IS LESS THAN THE DENSITY OF WATER?


The object will float.

FORMULA FOR DENSITY :


D= m/v



UNITS FOR DENSITY :


The same units as mass and volume:


Kg/m3  …   g/cm3…g/liter


  1.  What is the density of a piece of wood with a mass of 25.0g and a volume of 5cm3?


    5g/cm3






  1.  A rectangular block of copper has a length of 2cm, a width of 2cm, and a height of 2cm.  If the mass of the block is 64g, what is its density?


8g/cm3

USING DENSITY TO IDENTIFY SUBSTANCES


Substance

Density (g/cm3)

Water at 4 C

1.0000

Gasoline

0.70

Mercury

13.6

Iron

7.8

Aluminum

2.7

Gold

19.3

Ice at 0 C

0.92

Air

0.001293

Hydrogen

0.00009







Draw and color the liquid layers that form from the demonstration. 



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