### Notes on how to calculate density

```Notebook p 29
Three Ways To
Determine Density
1) Regular Objects
1. Measure the each side of the block in
centimeters. Calculate volume in cm³:
multiply the length x width x height.
2. Place the block on a balance and determine
the mass in grams.
3. Calculate density D= m
V
Calculate the Density
• A block of bamboo measures 7.25cm x 3.91cm
x 2.55cm. The mass of the block is 28.91 g.
What is the density of the block?
• D = m/V
Calculate the Density
• A block of bamboo measures 7.25cm x 3.91cm
x 2.55cm. The mass of the block is 28.91 g.
What is the density of the block?
• D = m/V
D = 28.91 g / 7.25cm x 3.91cm x 2.55cm
D = 0.40 g/ cm³
2) Irregular Objects
1. Measure water in
object and measure
again. Calculate volume:
2nd # - 1st #.
2. Place object on balance
and determine mass in
grams.
3. Calculate density D= m
V
Calculate the Density
• A sample of lead is found to have a mass of
32.6g. A graduated cylinder contains 2.8ml of
cylinder, the water level reads 5.7ml.
Calculate the density of the lead sample.
• D = m/V
Calculate the Density
• A sample of lead is found to have a mass of
32.6g. A graduated cylinder contains 2.8ml of
cylinder, the water level reads 5.7ml.
Calculate the density of the lead sample.
• D = m/V
• D = 32.6 g / (5.7ml – 2.8ml)
• D = 32.6 g / 2.9ml
• D = 11.24 g/ml
3) Density of a Liquid
cylinder on balance and
determine the mass in
grams.
amount to find volume.
on the balance. Calculate
mass: Full cylinder – empty
cylinder.
4. Calculate density D= m
V
Calculate the Density
• A graduated cylinder has a mass of 83.20g.
After 350ml of liquid mercury is added the
cylinder has a mass of 4,843.20g. What is the
density of the mercury?
Calculate the Density
• A graduated cylinder has a mass of 83.20g.
After 350ml of liquid mercury is added the
cylinder has a mass of 4,843.20g. What is the
density of the mercury?
• D = m/V
• D = (4,843g – 83.20g) / 350ml
• D = 4760g /350ml
• D = 13.60 g/ml
```