1. Density

2. What is density?
Every object has a measureable features such as mass and volume.
Density: The ratio of an objects mass to volume
Mathematically  D = m / V

3. Density The mass of a substance can be measured using a balance.
Mass is a measure of a substances amount of matter.

4. Density (cont) Volume: how much space an object takes up
The volume of solid can be found 2 ways:
1) direct measurement – regularly shaped solid
EX: L x W x H
2) water displacement – irregular shaped solid

5. Density Standards
Water is considered to be a standard in terms of density.
Water has a density of 1.00 g/mL.
If an object floats in water, the object is less dense than water.
If an object sinks in water, the object is more dense than water.

6. m = D x V V = m / D D = m / V Solving for Density
The formula for density is:
D = m / V
You can rearrange this using algebra to solve for both mass and volume!!
m = D x V V = m / D

7. DENSITY TRIANGLE

8. Example #1:
A 3.00 mL sample of water has a mass of 2.99 g. What is the density?
D = m/V  D = (2.99g/3.00mL)
Density = 0.99 g/mL
Units for density are g/mL

9. Example #2
Oil has a density of 0.90 g/mL. If I have a 30 mL sample of oil, what would be the mass?
m = V x D  m = (30mL x 𝑔 𝑚𝐿 )
[cancel mL units!]
answer: 27 g Oil

10. Example #3:
Aluminum has a density of 2.70 g/mL. If I have a sample of aluminum that has a mass of 5 g, what is the volume of the sample.
V = m/D  V = (5 g ÷ 𝒈 𝒎𝑳 )
Volume = 1.85 mL