Measuring Matter

Matter• Anything that has mass and takes up space

Mass•The amount of matter in an

object•Measured in grams or

kilograms•Measured by a triple beam

balance

How is mass different from

weight?• Weight can change, mass doesn’t• For example, you weigh less

underwater than you do on land. But your mass stays the same.

• What happens to your weight when you go into space??

Using a Triple Beam Balance

• Place an object on the left side of the balance.

• Move the three different weights until the lines on the right match

• Add the three weights together

What mass is shown here?373.5 grams

Units of Measurement• Volume of Regular Object =

– cm³ (cubic centimeter)–m ³ (cubic meter)

• Volume of Irregular Object= –mL (mililiter)– L (liter)

• Mass=– g (gram) – kg (kilogram)

•Density=-g/mL-g/ cm³

Volume•The amount of space matter occupies

•How to find the volume of a regular object:

length x width x height

Your Turn

↕ 35cm ⃡

• What is the volume of this cereal box?⃡

3850 cm³

22 cm

5 cm

Volume of an Irregular Object

• Fill a graduated cylinder with water

• Measure the water level• Place the object into the water• Measure the water level now• New water level

-Old water level

Your Turn• What is the water

level at first? 32 mL

• What is the new water level?

38 mL

38-32=6mL

• What is the water level at first?

30 mL• What is the

new water level?

40 mL

40-30=10 mL

Density•How much matter there is in a certain

amount of space

Density=mass/volume•Which square is more dense?

3 cm 3 cm

Mass- 5 g Mass- 20 g

Density

Volume= 3x3x3

27 cm ³3 cm 3 cm

Volume= 3x3x3

27 cm ³Mass=5 gDensity=5/27

0.18 g/cm³

Mass=20 gDensity=20/27

0.74 g/cm³

Your Turn• George has a watch. It has a mass of

16g and a volume of 4mL. What is its density?

4 g/mL

• Joshua has a wallet. It has a mass of 20g, and a volume of 4 mL. What is its density?

5 g/mL

• Melissa has a book. It has a mass of 275g and a volume of 588cm3. What is its density?

0.46 g/cm³

• Melissa also has a notebook. It has a mass of 279g, and a volume of 456 cm3. What is its density?

Your Turn

0.61 g/cm³

Density demo

• http://www.sugarstacks.com/beverages.htm