Density
A physical property
Density
Density - the amount of mass per unit of
volume.
It can be expressed in the following formula.
Density

The formula…
Density = mass
volume
Or
D=m/v
Understanding Density

In order to understand density, you must first understand
mass and volume.

Mass-The amount of matter in an object.
(balance/scale)

Volume-The amount of space occupied by an object.
(ruler and formula or graduated cylinder)

So density is just the amount of matter in an object
divided by the space that the object occupies.
Density

Density = mass / volume

Density compares mass to volume.

If you have any two components, you can
“figure out” mathematically the third
component by substituting the numbers in
the formula. (D=m/v)
Density

Density = mass / volume

To calculate density, substitute numbers
(preferable from your data) for mass and
volume.

You would use a scale or a balance to find
mass, and you could either use a formula (l x w
x h) or use a graduated cylinder to find volume.
Volume
The formula for volume is …
V=lxwxh
(volume = length x width x height)
Or,
you could simply see how much water a solid or liquid
object displaces in a graduated cylinder.
Density

You can even determine the relative
densities of liquids by the layers that are
formed when they are mixed, or what
floats upon what.

More dense substances sink.

Less dense substances float.
Density of Water

The density of water is 1gram per milliliter,
or D=1g/ml

Substances that are more dense than
1g/ml will sink when placed in water.

Substances that are less dense than 1g/ml
will float when placed in water.
Density in Solids

A couple of video clips might help with
your understanding…

D = m/v……………..where v = l x w x h

Practical applications of density
Density in Liquids

A couple of video clips might help with
your understanding…

When liquids don’t mix

Density of water, sinkers and floaters