Density !

Density

Density is a relationship between a substance’s _______ and its _________. It is a measure of how _________ packed the atoms are in a substance.

massvolume

tightly

Look at the following picture:

Each box has the same volume. If each sphere has the same mass, which box would weigh more? Why?

The box that has more spheres has more _______ per unit ________. mass volume

Mass

Mass is the amount of ________ in an object.

matter

Mass does not change unless you _____ or __________ matter.add subtract

Volume

Volume is the amount of _______ an object occupies.

space

Solids and liquids have a ___________ volume – you can’t change it without _______ or ___________ matter.adding

definite

Gases do not have a definite volume, but fill the _______ and ________ of their containers.

size shape

subtracting

Density Relationship

Density measures the amount of ______ per unit _________.mass volume

The formula to calculate density is:

D =mv

Example:

An object has a mass of 30 g and a volume of 6 mL. What is its density?

D = mv

30 g

6 mL=

Density = 5 g/mL

Finding Mass and Volume

If you have the density and one of the other values, you can find the third!

D

m

v