Density Flashcards

All 6 cards in this deck

What is the equation for density?

density $=$ mass $\div$ volume
$\rho = m / V$, with mass in kg and volume in m$^3$ giving kg/m$^3$.

What is the SI unit of density, and what other unit is often used?

kg/m$^3$; g/cm$^3$ is also used.

What are the steps to find the mass of an object from its density and volume?

e.g. density $2000$ kg/m$^3$, volume $3$ m$^3$

1. Rearrange: mass $=$ density $\times$ volume
2. Substitute: $2000 \times 3$
3. Mass $= 6000$ kg

What are the steps to convert a density in g/cm$^3$ into kg/m$^3$?

e.g. $2.7$ g/cm$^3$

1. Multiply the value by $1000$: $2.7 \times 1000$
2. Density $= 2700$ kg/m$^3$

What is the density of water in kg/m$^3$ and in g/cm$^3$?

$1000$ kg/m$^3$, which is $1$ g/cm$^3$.

True or false? A large object always has a greater density than a small object.

False. Density depends on mass divided by volume, so a large light object can be less dense than a small heavy one.