2. Density

3. Measurement
Definition
Units
Instrument Used to Measure
Mass
Amount of matter in a substance
g, kg, mg
1 kg = 1000 g
1 g = 1000 mg
Balance (units = g).
Must tare (set to 0.0g) to only obtain mass of the substance.
Volume
Amount of space a substance occupies.
cm3, mL, L
cm3 = mL
1L = 1000mL
For containers, use a ruler
(V = lwh).
For irregularly shaped objects, use the displacement of water (change in volume when object fully submerged).
Density
Amount of matter per unit of volume.
g/mL = g/cm3
Calculated with:
D = mass ÷ volume
**Density of water is 1.00g/mL**

5. Objects that are less dense will float/rise up
Ice in water
Oil on water
Helium balloon in air
Objects that are more dense will sink/fall down
Rocks in water
Natural gas in air
Calculating density:
Since density is the amount of matter per unit of volume, it can be calculated using the following formula:

6. Examples
An object has a mass of 1.17kg and occupies 150cm3 of space. Calculate its density.
Mr. Brown has 75mL of a beverage that has a density of 13g/mL. Calculate its mass.
Mrs. Brown has 3kg of candy for her class. She knows that the density of the candy is 12g/cm3 (don’t ask how), but the package is irregularly shaped and she wants to calculate its volume. Help her out!

7. Homework
Density Word Problems worksheet