1. A Look at Density and How to Calculate It.
Diggin’ That Density
A Look at Density and How to Calculate It.

2. Remember Back Mass- Amount of matter something is made of.
Volume – Amount of Space something takes up. It is 3-Dimensional

3. Remember Back Mass- Measured in grams (g).
Volume – Measured in milliliters (mL) or in cubic centimeters (cm³)

4. Remember Back Mass is how much of something you have.
So volume is the amount of space you have and….

5. Bring it Together Density is a combination of volume and mass.
Density is the amount of matter in a given volume.
The amount of “stuff” in a certain “space”

6. Figuring it Out
There is a mathematical formula for calculating density.
Density = Mass  Volume
D = M  V

7. Units for Density
Just like length, volume and mass density has to be labeled with the correct unit.
g/cm³ or g/mL is the standard unit for density.
Remember that a cm³ is basically the same as a mL.

8. D. Density V = 825 cm3 M = DV D = 13.6 g/cm3 M = (13.6 g/cm3)(825cm3)
An object has a volume of 825 cm3 and a density of 13.6 g/cm3. Find its mass.
GIVEN:
V = 825 cm3
D = 13.6 g/cm3
M = ?
WORK:
M = DV
M = (13.6 g/cm3)(825cm3)
M = 11,220 g

9. D. Density D = 0.87 g/mL V = M V = ? M = 25 g V = 25 g 0.87 g/mL
1) A liquid has a density of 0.87 g/mL. What volume is occupied by 25 g of the liquid?
GIVEN:
D = 0.87 g/mL
V = ?
M = 25 g
WORK:
V = M D
V = g
0.87 g/mL
V = 28.7 mL

10. D. Density M = 620 g D = M V = 753 cm3 D = ? D = 620 g 753 cm3
2) You have a sample with a mass of 620 g & a volume of 753 cm3. Find density.
GIVEN:
M = 620 g
V = 753 cm3
D = ?
WORK:
D = M V
D = g
753 cm3
D = 0.82 g/cm3

11. Let’s Practice
Liquid E had a mass of 82.61g. You massed 100mL of this liquid.
Plug it into the formula.

12. Let’s Practice
D = 82.61g  100mL
D = .8261g/mL

13. Will it Float?
Density can predict if something will float. How?

14. Will it Float?
The object with a higher density than water sinks. If it has lower density it floats.

15. Density of Water
Using our results from yesterday, what is the density of sea water?
g  100 mL =
g/mL.

16. Measuring water
If you wanted to measure 25ml of water, what instrument would you use?

17. Density of Water Calculate the density of water
One milliliter of water
Has a mass of 1 gram
Density = Mass ÷ Volume
Calculate the density of water
1g ÷ 1ml = 1g/ml

18. Measuring water
If you wanted to measure 25ml of water, what instrument would you use?

19. Measuring water 2
If you wanted to measure 25 grams of water, what 2 instruments could you use?

20. Measuring volume of a solid by water displacement

21. One cubic centimeter = one milliliter
Using water displacement,
how many milliliters do
you expect the water
to raise when the cube
is lowered?
This cube’s sides are
each 3 cm. What is
the volume of the cube?
27 cubic cm
27 ml

22. Graduated cylinder measurement
Volume is measured using a graduated cylinder.
When reading a graduated cylinder, read the bottom of the meniscus.