Matter is anything that has mass and takes up space. It exists in three states: solid, liquid, and gas. In solids, particles are tightly packed; in liquids they are less tightly packed; and in gases particles move freely. Matter can change states through heating and cooling - for example, water exists as a solid (ice) when cold, a liquid at room temperature, and a gas (water vapor) when boiled. Changes between these states are called melting, freezing, boiling, evaporation, and condensation.

1. What is
Matter?
Third Grade

2. What is matter?
• Everything is matter!
• Anything that has mass and takes
up space is matter.
• It includes all the things that you
can see, touch or smell.
• Your desk, paper, pencil, and even
the air you breath are matter.

3. Matter everywhere
• Many things that you cannot see, smell or
touch are also matter.
• Air is an example of matter that you cannot
see, smell or touch.

4. Matter has mass
• You can feel the mass of things as weight
when you pick them up.
• When you blow up a balloon, you see that
even air takes up space.

5. • Look at the hockey puck and volleyball.
• The puck is small and hard.
• The volleyball is large and soft.
• The puck and volleyball look different, but
both are matter.

6. Hockey puck volleyball
Both are
matteran
d used for
sports.
Black,
flat
and
hard
Yellow,
white,
big
and
soft

7. States of matter
• All matter is made of small
particles. These particles are
so small that you can not see
them, even under a magnifying
lens.
• The particles are always
moving.

8. • In some kinds of matter the
particles are held tightly together
• In other kinds of matter they are
held less tightly.
• States of matter are the form that
matter can take
• Three states of matter are solids,
liquids, and gases.

9. • In solids particles are packed
tightly together.
• In liquids particles are packed
together less tightly.
• In gases particles move about
freely.
• Your science book is a solid. Like
other solids, the book does not
change shape.

10. • The particles of solids are held
tightly together.

11. Solids:
• solids are made of tightly
packed particles.
•Solids have their own shape.
•You can easily measure both
the mass and the volume of
solids. Like your science book,
the fabric of the balloons and
balloon baskets are also solids.

12. particles are tightly
packed in solids

13. Liquids:
• particles in liquids are held
together less tightly.
•The particles in a liquid flow
past one another.
•Liquids take the shape of their
containers.
•If you pour a liquid from one
container to another, the liquid
will take the shape of the new
container.

14. particles are
held less
tightly in
liquids
•You can easily measure the mass
and the volume of liquids.

15. Gases:
•The tiny particles that make up
gases are far apart compared to
solids and liquids.
•The particles of a gas move freely
and take up the space of their
container.
•The particles of a gas bounce off
one another as they move freely.

16. •All matter has mass, so gas has
mass too. You can measure the
mass and volume of a gas.
•The air in the balloon is gas. The
air takes the shape of this balloon.
•The particles of air move freely in
the balloon.

18. Changes in water
• Matter can change states
through heating or cooling.
•When water heats up, the space
between the water particles
becomes greater.
•When water cools down the space
between the particles becomes
less.

19. •When liquid water cools to 0°C
(32°F), it freezes , or changes
from a liquid to a solid. It changes
to ice, solid water.
•When ice is heated, it melts , or
changes from a solid to a liquid. Ice
melts at 0°C.
•You can see water as a liquid and
as a solid.

20. water as liquid
water as solid

21. •You cannot see water as a gas.
•Water as a gas is called water
vapor.
•When water is heated to 100°C,
it boils, or changes from liquid
water into bubbles of water
vapor.
•Water vapor and steam are not
same; steam is droplets of liquid
water in the air.

22. Water
vapor

23. Steam is
not
water
vapor.

24. •When water boils, it evaporates.
•Evaporation is the change from
liquid water to water vapor.
•Evaporation can also happen
slowly at the water surface.

25. •Notice the water droplets on
the outside of the pot of water.
•Where does that water come
from?
•When water vapor in the air
cools, it can change back into
liquid.
•The water vapor condenses.
•Condensation is the change
from a gas into a liquid.

26. Water
evaporation
and condensation