# A Beginner's Guide to Calculating Density

This posting provides a general definition of density as well as two example to calculate density. The first example is based on finding the density of a cube by calculating the cube's volume. The second example is based on finding the density of an egg using the volume displacement method.

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## SOLUTION This solution is **FREE** courtesy of BrainMass!

Density is defined as the average mass per unit volume; it is a measure of how much matter is squeezed into a given space. The more closely packed the molecules, the higher the density of the material.

The equation for density is as follows:

Density = Mass (g) / Volume (cm3)

To find the density of an object, both the mass and the volume need to be known.

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Example One

While playing with his rubix cube, Dexter decides he wants to know the cube's density. First, he takes out his handy balance, and masses the cube.

It measures in at 100 g.

Being that the rubix is a cube, he finds the volume by measuring the length, width and height using his ruler.

The length is 10 cm.

The width is 10 cm.

The height is 10 cm.

He then calculates the volume by using the formula for the volume of a cube.

V = L * W * H

V = 10 cm * 10 cm * 10 cm

V = 100 cm2 * 10 cm

V = 1000 cm3

Dexter finds that the volume of the Cube is 1000 cm3. To find the density, Dexter uses the formula:

Density = Mass/Volume

D = Mass / Volume

D = 100 g / 1000 cm3

Density = 0.1 g /cm3

Dexter's rubix cube has a density of 0.1 g /cm3.

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Example Two

Cecilia, while making breakfast, decides she wants to know the density of an egg. She steals Dexter's balance and begins by massing the egg.

It comes to 15 g.

She then fills up a graduated cylinder to 50 mL. She then drops the egg in. The water rises to the 70 mL mark. Cecilia takes the final measurement (70 mL) and subtracts the initial measurement (50mL) to get 20 mL. She also knows that one mL is equal to one cm3 so she writes 20mL as 20 cm3.

To find the mass she uses the equation for density:

Density = Mass / Volume

D = 15 g / 20cm3

D = 0.75 g /cm3

The density of Cecilia's egg is 0.75 g /cm3.

Â© BrainMass Inc. brainmass.com September 29, 2022, 12:52 pm ad1c9bdddf>https://brainmass.com/chemistry/stoichiometry/beginners-guide-calculating-density-230504