1. Density !

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

3. 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 ________. massvolume

4. Mass Mass is the amount of ________ in an object. matter Mass does not change unless you _____ or __________ matter. addsubtract

5. 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. sizeshape subtracting

6. Density Relationship Density measures the amount of ______ per unit _________. massvolume The formula to calculate density is: D = m v

7. Example: An object has a mass of 30 g and a volume of 6 mL. What is its density? D= m v 30 g 6 mL = Density = 5 g/mL

8. Finding Mass and Volume If you have the density and one of the other values, you can find the third! D m v