Density Flashcards
What is density?
A measure of the mass per unit of volume of a substance.
Materials with higher density…
Sink
Materials with lower density…
Float
Bigger atoms tend to be…
More dense
Density formula
Density (kg/m^3 or g/cm^3) = mass (kg or g) / volume (m^3 or cm^3)
ρ = m/v
where ρ = density. It must be a rho, or you will lose a mark, not a p.
Measuring the density of an irregular object
Mass - balance
Volume - Eureka can, measuring the difference in volume between the object and water (fill right below spout for accuracy)
How to measure the volume of water?
Measuring cylinder
Draw the setup of the Eureka can and measuring cylinder
N/a
Potential problem with test
Getting water everywhere
1ml =
1cm^3
Determining Density of an irregular solid practical
Equipment:
- eureka can
- mass balance
- measuring cylinder
- thread
Method:
1. Fill the Eureka Can with water up to just below the level of the spout
2. Set up the Eureka can over a block in line with the measuring cylinder, where the spout is
3. Using a balance, measure the mass of the solid
4. Immerse the object using a thread, avoiding splashing
5. Collect the displaced water. Record the volume of water spilled into the measuring cylinder
6. Repeat this 3 times and calculate an average
7. Calculate the density of the material
8. Repeat the above procedure with other solid materials
How does density vary between repeats of the experiment to determine the density of an irregular object?
The volume gradually decreases, as water is lost from the Eureka Can between repeats, increasing the density as ρ = m/v.
What is another word for the determining density of an irregular solid experiment?
Water displacement method
Density of water
Approx. 1g/cm^3
Regular shape volume
V = l x w x h
