## Part III: Finding the density of an object

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/cm3,.

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:

grams/cubic cm.

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:

grams/cubic cm.

### 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