Mass, Volume, Density

1. Mass, Volume, &
Density
What makes the ice cubes float in your water?

2. Mass of an Object
Mass – Amount of matter in an object.
*Reminder* Matter is a substance that
takes up space.

3. Mass
Mass is measured in grams.
We will measure mass using a triple
beam scale.
Mass is constant and doesn’t change
like weight (gravity).

4. Triple Beam Scale
Make sure to start off
zeroing the scale.
To find mass: Go to
biggest way and work
your way down the scale
to smallest until it is
balanced.

5. Volume
This is a measurement of the amount of
space an object takes up or occupies.
We will measure volume in the units of
Millileters (mL) or cm^3.

6. Liquid Volume
To measure our
liquid we will use a
graduated cylinder.
*Tip* get on eye
level with the liquid
to take an exact
measurement.
Unit for liquid is mL

7. Solid Volume
The unit we will use here is cm^3
mL=cm^3
Usually measured by L x W x H
We will measure our ice in the graduated
cylinder.

8. Density
Density: 2 ways to view it
1. The mass of a substance per unit volume
2. How many particles there are in a area of space.
Units: g/cm^3 or g/mL

9. Density equation
Density is an objects ratio of its mass to
volume.
Mass:Volume
Density= Mass/Volume.

10. Density Triangle
How to use:
1. Cover up the term you are looking for.
2. Use the two other variables to find the
one you are looking for.
3a. If they are beside each other then
multiply.
3b. If one is on top of the other then divide it
by the bottom one.

11. Density Example
Mass of wool ball: 103 grams
Volume of wool ball: 2000mL
What is the density?
Density = 103g/2000 mL
Density = 0.05 g/mL

12. Density Example 2
A 275 g object occupies a volume of 250 mL.
What is the density?

13. How to change Density
We can either keep the mass the same and
change the volume
Or we can change the mass and keep the
same volume

14. Change the Mass
If we increase mass then we increase
density
If we decrease mass we decrease density
Look at example below: Left has less mass
and right has more mass.

15. Change the Volume
Increasing the volume will decrease the
density
Decreasing the volume will increase the
density.
Look at example below: Left has increased
volume and right has decreased volume.

16. Hmmm…
So What makes your ice float?