Density

Density

The amount of matter The amount of matter compared to the space compared to the space

it occupiesit occupies

Density of a Density of a pure substancepure substance at at room temperature is always room temperature is always

the samethe same

For example, water has For example, water has a density around a density around

1.0g/mL whether it is a 1.0g/mL whether it is a drop, a cup, or a drop, a cup, or a

swimming pool full!swimming pool full!

Quantifying Density

We UNDERSTAND that objects made of different materials may have different densities, but how

can we measure densities?

DensityThe The

amount of amount of matter matter

compared compared toto the the

space it space it occupiesoccupies

massmass

volumevolume

D = M/V

You got a really good deal on a gold You got a really good deal on a gold chain for your dad for Father’s day. chain for your dad for Father’s day.

The chain has a mass The chain has a mass of 1000g, and water of 1000g, and water displacement gives displacement gives

a volume of 370 a volume of 370 cmcm33. Did you get a . Did you get a

good deal? good deal?

We know that D=M/V. Let’s find the density of We know that D=M/V. Let’s find the density of this chain and see if it is gold!this chain and see if it is gold!

mm

vvD =D =

1000g1000g

370 cm370 cm33==

2.7g2.7g

cmcm33==

The chain has a mass of 1000g, and The chain has a mass of 1000g, and water displacement gives a volume of water displacement gives a volume of 370 cm370 cm33. Did you get a good deal?. Did you get a good deal?

See p. 13 in your text

Characteristic propertyCharacteristic propertyA feature of a material that A feature of a material that can be used to identify a can be used to identify a

specific materialspecific material

How would you describe How would you describe your teachers to your your teachers to your

parents as they leave for parents as they leave for Back to School Night?Back to School Night?

Density experiment you can try at home

Remember that the layers are formed

according to the density of the liquids

Density experiment you can try at home

Remember that the layers are formed

according to the density of the liquids