Take
a look at the two boxes below. Each box has the same volume. *If each
ball has the same mass, which box would weigh more? Why?*
The box
that has more balls has more mass per unit of volume. This property of matter
is called density. The density of a material helps to distinguish it from other
materials. Since mass is usually expressed in grams and volume in cubic centimeters,
density is expressed in grams/cubic centimeter.
We can calculate density using the formula: **Density=
Mass/Volume** In
the previous lesson you calculated the mass and volume of two blocks. If you would
like to review these sections click on the appropriate links shown at the left.
### Block I Mass
= 79.4 grams Volume=29.8
cubic cm. **Block
II:**
Mass=
25.4 grams Volume=29.8
cubic cm. ### Now
Let's calculate the density for each of these blocks.Please
enter your answer for Block I in the space provided: *If you need
a calculator one is available. Click on calculator in right frame.*
### Please
enter your answer for Block II in the space provided: *If you need
a calculator one is available. Click on calculator in right frame.*
### ### What
is each block made of?
Using the table below it is now possible for you to determine what substance makes
up each block. ### The
densities for some common substances are:
**Substance
** | **Density**
(gm/cu.cm) | Air | 0.0013 |
Wood (oak) | 0.85 |
Water | 1.00 |
Ice | 0.93 |
Aluminum | 2.7 |
Lead | 11.3 |
Gold | 19.3 |
Ethanol | 0.94 |
Methanol | 0.79 |
**Block I
is made of:**
**Block
II is made of :** |