1. Physical Science: Fluids and Dynamics
Outcome C7 – Determining the density of objects

2. Volume and density – Section 4.7
True or false
The volume of a substance can be affected by and increase of temperature
The volume of a substance will change as temperature increases because the particles of matter are moving faster and further away from each other
Different for gases and liquids

3. Volume and density True or false
The density of a substance can be affected by its temperature

4. Volume and density – Section 4.7
Volume – measurement of the amount of space occupied (taken up) by matter
Density – the mass of a substance in every unit volume of the substance
Ex: 1 kilogram of water is 1 litre in volume. It’s density is 1kg/L
Density is measured in units of mass/volume
WRITE NOTATIONS FOR DENSITY ON BOARD
Formula

5. Volume and density – Section 4.7
What would the density of an object with the following specifications be?
10m x 3m x 2m
Mass of 5kg

6. Volume and density – Section 4.7
A car has a mass of 1200Kg and when put into a giant tank of water, it displaces 300L of water.
What is its density?

7. Volume and density – Section 4.7
When comparing density between substances, the more dense substance will seem to sink. The less dense substance will seem to float
A common example is oil and water

8. Volume and density
In general: Solids are more dense than liquids, and liquids are more dense than gasses.
So when comparing density of substances, we should compare substances that are in the same state
The density of water is 1.00g/mL. Density of various substances are commonly compared to water.
Therefore, substances will have a density either greater than 1 or less than 1

9. ONE MINUTE TO THINK OF AN ANSWER WITH YOUR PARTNER
Volume and density
Comparing volume and density.
1. When the temperature of a substance is below freezing, the substance is a solid (relatively low volume) and its density is greater than 1
What do we mean when we say the volume of the substance is relatively low?
ONE MINUTE TO THINK OF AN ANSWER WITH YOUR PARTNER
TIME IS UP
30 SECONDS LEFT

10. Volume and density Answer:
We are referring to how the particles of matter inside a substance is packed very close together.
This means that it will take up less space, and have a lower volume

11. Volume and density
2. When the temperature of a substance is above freezing, then it is a liquid.
Its volume and its density is at its middle range
3. When the temperature of a substance is at it’s boiling point, then it becomes a gas.
Its volume is at its highest and its density is at its lowest
There is however an exception we see every day
 Water!!!