Transcript Density
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