2. Matter

3. Chapter Four: Density and Buoyancy

4. Density The mass of the object per unit volume
Expressed in units of g/ml or g/cm³
It’s a characteristic property of all matter
All objects have a specific density and it can be used as an identifier
Density equals mass divided by
volume…… or density equals heart.

5. 4.1 Density There are two other forms of the equation.
Mass equals density X volume
Volume equal mass ÷ density

6. Displacement
In a graduated cylinder or other measuring device, place a known amount of water.
Add the irregular object and measure the increase in volume.
This is the volume of the object, as long as it is submerged

7. Density On the Atomic Level
More dense materials have a more tightly packed group of atoms and molecules.
Less dense materials have a less tightly packed grouped of atoms and molecules.

8. Density and States of Matter
Solids are usually more dense than liquids and liquids more dense than gases. Water is less dense as a solid than a liquid.