Density

If density is a measure of how tightly the matter within an object is packed together which of the cubes above has the greatest

density?

DensityDensity is a physical property of a substance

that is used to identify that substance.

The size of the object does not change the density. The density of Lead is going to be the same.

Density of Lead

Density of Lead

Density of Lead

OR

•Density is a measure of a substance’s mass per unit volume

•The word “per” means to divide!!!

•In our formula to the left you can abbreviate the terms with the first letter.

THESE FORMULAS CAN ALWAYS BE FOUND ON

YOUR REFERENCE SHEET!

We use one of two methods to remember how to calculate density.

Method 1:

I Density

Method 2:

DM

V

Density Triangle

There is only ONE rule to using the density triangle.

Cover what you are looking for!

Identifying your units!

The base unit for mass (m) of an object is grams (g).

The base unit for volume of a solid is cubic centimeters ( ).

The base unit for volume of a liquid is milliliters (ml)

The two types of solids:

Regular solid: a solid which the sides can be measured using a ruler

to get the volume.

V= L x W x H

Irregular solid: a solid with sides that are not capable of being measured with a ruler.

Example: odd shaped rockFor this type of object we use

WATER DISPLACEMENT

Water Displacement

To Find the volume of an irregular solid:

1. Using a graduated cylinder fill with water to a specific amount such as 100 ml.

2. Slowly lower object in to the graduated cylinder (the water will rise).

3. Subtract the final amount from the initial amount and that will be the volume of the object.

4. Convert from ml to .

Rule of Thumb:

1 ml = 1cm^3

Practice ProblemsA  piece of wood that measures 3.0 cm by  6.0 cm by 4.0 cm has a mass of 80.0 grams. What is the density of the wood? Would the piece of wood float in water?  (volume = L x W x H)

Practice Problem 2A 800g boulder has a density

of 8 g/cm3. What is the volume of the boulder?

H.O.T Practice ProblemArchimedes was commissioned to determine

if the crown given to the king was pure gold or not. If the crown had a mass of 882 grams and displaced 50 mL of water, was the crown pure gold? Show the calculation, the density of Pure Gold is 19.3 g/cm^3.