Density

Formula

• The definition of Density is the amount of molecules in a space

• The formula to find density is D=M / V

• M is for mass which could be measured with a Triple Beam Balance

• V is for volume, can be measured with a Graduated Cylinder or a ruler

Floating and sinking

• The Density of an object can determine if it floats or sinks

• If the Density is greater then 1.0 g/ml the object will sink

• If the object has a Density of 0.1g/ml through 0.9 g/ml it will float

• If the objects has a Density of 0.5 half of the object will be submerged in water

Floating and sinking (cont)

• But if the objects Density of 1.0 it will stay neutral or in the middle of the water

Constant

•Density is a Constant •This means the density remains

the same, it doesn’t change•For example if you take a cork

and cut it in half, the Density will not change

•When you cut an object the Mass and Volume change, but the Density remains a constant

Solids, Liquids, and Gases Densities

• A solid has a lot of molecules in a given space

• The more molecules the more mass which gives it a higher Density, which determines if it sinks or floats

• A liquid has not as much mass in a given space this gives it a lower density

• And a gas has not much mass for a lot of volume which gives it a lesser Density

Liquid

•The oil has a Density less then water which is 1.0 g/ml

•This causes it to float on top of the water

Solid

• This solid has a Density more then 1.0 g/ml therefore making it sink to the bottom

• If the objects Density was 1.0 g/ml it would neither float nor sink

Gas

•Gas has a low Density this is why it’s in our air we breathe

•The Molecules are very far apart not energetic

True or False

• Densities formula D=M/V?

• If the object has a Density of 1.1 it’s neutral?

• Do you use a scale to find Density?

• Solids Densities are always less then 1.0?

• Volume can be recorded with a Graduated Cylinder?

Answers

•True •False •False •False •True

The End