Measuring MatterChapter 2 Section 2

Weight

•Weight is a measure of the force of gravity on an object.

•Would your weight be the same if you were on the moon?

You would weigh about1/6 of what you weigh on Earth!

MASS

•Measurement of the amount of matter in an object.

•Does your mass change on the moon?

• A physical property

Units of Mass

• International Systems of Unit “SI”

• SI unit of mass is the KILOGRAM.

•How many grams are in a kilogram?

1,000

= 150 grams

= 5 grams

What is my mass?

Volume• The amount of

space that matter occupies.

• Liquids, Solids, & Gases have volume.

Units of Volume• liter (L)

•milliliter (mL)

• cubic centimeter (cm³)

1 Liter bottle = 1,000 milliliters

1 milliliter = 1 cubic centimeter

What is my volume?

= 4.92892159 milliliters

= 355 milliliters

Calculating Volume• Volumes of solids are usually

expressed in cubic centimeters

• Volume = Length x width x height

•Don’t forget to label the units!

•How do you measure the volume of an irregular object?Water level rise = Volume of object in

milliliters

If a penny makes the water go up 4 milliliters,

what is its volume?

4 cubic centimeters

Density• Two materials have the same volume, do they have to have the same mass? NO!

A kilogram of sand takes up much less space than a

kilogram of feathers!

The volumes differ because they have different

densities.

Density relates the mass of a material in a

given volume.

# of grams in one cubic

centimeter

Density of Water•Water at room temperature = 1g/cm³

This means:every gram of water has a

volume of 1 cm³

Density = MassVolume

The End