__Volume, Mass and Density__

*A Supplementary Activity for Students*

Take a look at the two boxes below. Each box has the same volume. **If each
ball has the same mass, which box would have more mass? Why?** If you have a VRML browser click on
**VRML** and rotate the objects to get a 3D-view!

**VRML**
**VRML**
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.

We can calculate density using the formula:

** Density= Mass/Volume**.

Since **mass** is usually expressed in **grams**
and **volume **in ** cm. **^{3}, density is expressed in
**gms/cm**^{3},.

In the previous sections you calculated the mass and volume of the unknown block.
to be:
**Mass = 79.4 grams**

**
Volume=29.8 cubic cm.**

Find the density of the block using the above formula.
Please enter your answer in the space provided:

If another block (block II) has the same volume and a mass of 25.4 grams what would its density be?
Please enter your answer for Block II:

### What is each block made
of?

The table belows gives the density for some common materials.
Using the above table can you tell what each block is made of?

Density

### Please send comments and suggestions

E-mail: *richm@acf2.nyu.edu*