1. DENSITY Q) Which weighs more:-
A kilogram of feathers or a kilogram of iron?
DENSITY
Cobb 2018

2. What is Density
Density is the amount of matter in a given space. Or how compact the mass is,in a given volume.

5. Calculating Density Equation:
g or kg m V D
Mass
Density =
Volume
g/cm3
cm3 or ml
D = m V

6. Which substance has a greater density?
Aluminium
Steel
Brass
Lead
27 cm3
27 cm3
27 cm3
27 cm3
471___g
271__g
87___ g
248___ g
Lead
Density is calculated
Mass /Volume

7. Calculating Density This is showing the work!!!!!
Steps
Write what you know
Write the formula being used
Substitute variable into formula:
Calculate
Check that your units agree: g/cm3?
Problem: A lead sinker has a mass of 227 g and a volume of 20 cm3. What is the density of lead? D=? M= 227g V=20 cm3 D = M/V = 227g/20 cm3 = 11.4 g/cm3

8. Try THIS! D=? M= 103g V=100 cm3 D = M/V = 103g/100 cm3 = 1.03 g/cm3
A glass of milk has a volume of 100 cm3. If the milk has a mass of 103 g, what is the density of milk?
D=? M= 103g V=100 cm3
D = M/V
= 103g/100 cm3
= 1.03 g/cm3

10. How is density useful? Density is useful for identifying substance
1. Density stays the same for any size or shape of the same substance.
2. Density is different for different substances.

11. DENSITY OF A REGULAR SOLID
Find the Mass of the solid on a balance.
Measure the three lengths and calculate the Volume.
(ie V = l x w x h )
Calculate the Density.
mass = 240 g
2.0 cm
D = m = 240 =10.0 g/cm3 V
3.0 cm
4.0 cm

12. DENSITY OF AN IRREGULAR SOLID
m = 360 g
 = m = 360 =12.0 g/cm3 V
Find the Mass of the solid on a balance.
Fill the Measuring Cylinder with Water to a known Volume.
Add the Object.
Work out the Volume of Water that is displaced.
Calculate the Density.
80 cm3
50 cm3

13. DENSITY OF AN IRREGULAR SOLID Video
OR use a “Eureka Can” to find the Volume.
Find the mass of the solid on a balance.
Add water until just overflowing.
Place a Measuring Cylinder under the spout.
Add the Object.
Collect the Water and read off the Volume.
Calculate Density
m = 440 g
40.0 cm3
 = m = 440 =11.0 g/cm3 V

14. DENSITY OF A LIQUID Find the Mass of an empty Measuring Cylinder.
Mass of Liquid = Mass of Measuring Cylinder and Liquid – Mass of the Measuring Cylinder
Find the Mass of an empty Measuring Cylinder.
Add a certain Volume of Liquid.
Find the Mass of the Measuring Cylinder and Liquid
Calculate the Mass of Liquid.
How?
Calculate Density of Liquid.
45.0 g
25.0 g
20.0 cm3
45 – 25 = 20 g
 = m = 20 =1.00 g/cm3
V 20

15. DENSITY OF A GAS
Remove the air from a flask of a known Volume, using a vacuum pump.
Find its Mass.
Add the gas to be tested.
Reweigh.
The difference is the Mass of gas.
Calculate Density.
To vacuum flask
150.0 g
170.0 g
1000 cm3
= 20.0g
 = m = 20 = g/cm3 V

16. Density (brainpop.com)
Why do boats float? Watch the following Brain pop video, take notes, take the quiz
Density (brainpop.com)

17. 5 facts about Density Write out an explanation to each fact in your notes!!!