Problem:
You have three containers of equal size, one filled with cement, one filled with water, and one filled with air.
 Which container would have matter that is very tightly packed?
 Which container would have matter that is loosely packed?
 What would happen if you put the cement, water and air into one large container?
CLUE: Density determines the hardness or softness of a material. In general the more dense a material is the heavier and harder it feels. Less dense material feels softer and lighter.
Why would loose snow be less dense that a snow ball?
How would each feel?
How can we determine an object's density?
All we need to do is some simple math after you have measured an object's mass and volume.
The formula for density is
Example:
You found the mass of a rock to be 20 grams. The volume of the rock is 40 cm^{3}
Note: the unit is grams per cubic centimeter.
when using the metric system you only use decimals and not fractions.
