Matter exists in three main states - solids, liquids, and gases. Solids maintain a fixed shape unless broken, while liquids flow freely and take the shape of their container. Gases expand freely to fill their container. Common examples of each state are ice (solid), water (liquid), and air (gas). The document provides examples and descriptions of the key properties of each state of matter.

1. Matter
What is matter?
Moira Whitehouse PhD

2. Matter includes everything
around us--
• our couch, our bed, our
computer
• our food and our drinks
• our family and our dog or
cat

3. • the grass and the trees
• the Sun and the Moon
• all the planets
• everything in our Universe

4. Yes!
Everything
Everything
Everything

5. Matter on Earth is usually in
one of three states.

6. solids

7. • Keep their shape unless they are broken
• Do not flow or pour
We know when matter is a solid
because solids:

8. liquids

9. We can tell when matter is a liquid because
liquids:
• Do not keep their own shape; they take the
shape of the container they are in.

10. And...liquids flow or pour.
Oil being
poured
on a
salad

11. Then what about sand,
sugar and salt? Don’t
they pour, flow and
take the shape of the
container they are in?

12. If you magnify
sand or sugar,
you can see
that they are
not liquids.
Sand, salt, and
sugar are made
up of very small
particles that
have a definite
shape .

13. Child blowing
air (a gas) into
a balloon.
gas
Then there is that third state of matter:

14. A balloon or a bubble are just
containers that hold a gas. For us
that gas is usually air.

15. There are other gases besides
those in air. These balloons
contain a gas called helium which
is lighter than air.

16. Air, like all gases,
takes the shape of
its container
and expands to fill
its container.

17. Most gases including the gases in
air are invisible—you simply cannot
seem them.
A jar of air

18. However, you do know air is there
when it moves things such as this
windmill.
Wind—moving
air– causes this
windmill to
rotate.

19. Or when you use the gas in your
lungs to blow out a candle.

20. But air is not one gas; it is
a mixture of many
different gases—mainly
nitrogen and oxygen plus
a little carbon dioxide,
argon and water vapor.
not one
mixture

21. This pie chart shows the many gases that
go together to make up air.

22. Gases are hard to observe
because remember, we said that
most are invisible.
Most gases have no color, no
taste, no smell and you cannot
feel them unless they move.

23. Because all these gases are invisible we
cannot tell one from the other just by
looking at them or smelling them.
Jar of
carbon
dioxide
Jar of
nitrogen
Jar of
oxygen

24. If you did not have any oxygen for more than a
few minutes you would die!
Without the very tiny bit of carbon dioxide
in the air, there would be no green plants.
Plants use carbon dioxide to make food.
Oxygen is also needed for things to burn.
Without oxygen nothing burns.
Although most of air is nitrogen, nitrogen gas
doesn’t do very much all.
But they are all very different gases.

25. Things burn much more quickly in pure
oxygen than in air. Air contains about 20
percent oxygen.
Velcro burning in air
smokes and smells but
doesn’t burn much,
because air is only 20
percent oxygen.
Velcro with pure
oxygen erupts in
flame.

26. Another common gas is Carbon
Dioxide. We learned in the last
slide that Oxygen is necessary
for things to burn. Carbon
Dioxide, on the other hand, puts
fire out.

27. Carbon dioxide gas reacts with a substance called
bromophenolblue changing it from a blue color to
yellow. To show that your breath has Carbon
dioxide, blow into a bromophenol solution.
Students exhaled
through a straw
into the
bromophenol blue.
The carbon dioxide
in their breath
changed the color
to yellow.

28. Making carbon dioxide
in a ziploc bag
Teachers, creating Carbon Dioxide in the ziploc bag allows students to see that there is
something there pushing the sides of the bag out. The gas fills its container and takes the
shape of its container, and it is invisible. If you insert a burning match or glowing splint
into the bag, students will see that this gas puts fire out.

29. Particles
in a solid
Particles
in a liquid
Particles
in a gas
Later on you will learn that movement of the tiny particles that make up matter
determines if the matter is a solid, a liquid or a gas.

30. Can you name the three states of
matter?
Bubbles hold
an invisible
gas called
water vapor
Can you tell the difference
between these three states?