Volume, Mass and Density

A Supplementary Activity for Students

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

Block I is made of:


Block II is made of:



Go to Part IV for the Challenge Questions

Please send comments and suggestions

E-mail: richm@acf2.nyu.edu


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