This document defines key terms and describes the three states of water - solid, liquid, and gas. Water can exist as ice when solid, which can be used for recreation, food preservation, and consumption. As a liquid, water takes the shape of its container and is essential for life as well as activities like swimming and irrigation. As a gas, water vapor or steam has no definite shape or volume and is used to form clouds, for ironing clothes, and cooking with steam.

1. Unit 4Unit 4
The Three States of WaterThe Three States of Water

2. VocabularyVocabulary
 Solid: having a definite volume and shape.Solid: having a definite volume and shape.
A substance or an object that is solid, notA substance or an object that is solid, not
liquid or gas.liquid or gas.

3. VocabularyVocabulary
 ICE: water that has frozen and becomeICE: water that has frozen and become
solid.solid.

4. VocabularyVocabulary
 Liquid: Having a definite volume but noLiquid: Having a definite volume but no
definite shape. A substance that flowsdefinite shape. A substance that flows
freely and is not a solid or a gas.freely and is not a solid or a gas.

5. VocabularyVocabulary
 Water: A liquid without color, smell or tasteWater: A liquid without color, smell or taste
that falls as rain, is in rivers and seas, andthat falls as rain, is in rivers and seas, and
is used for drinking.is used for drinking.

6. VocabularyVocabulary
 Gas: having no definite volume andGas: having no definite volume and
shape. Any substance like air that isshape. Any substance like air that is
neither solid nor liquid.neither solid nor liquid.

7.  http://www.youtube.com/watch?v=btGu9FWSPhttp://www.youtube.com/watch?v=btGu9FWSP

8. VocabularyVocabulary
 Water vapor: The gaseous state of water.Water vapor: The gaseous state of water.
Formed when water evaporates.Formed when water evaporates.

9. VocabularyVocabulary
 Steam: The hot gas that water changesSteam: The hot gas that water changes
into when it boils.into when it boils.

10. VocabularyVocabulary
 Definite: sure or certain; unlikely toDefinite: sure or certain; unlikely to
change.change.
 Volume: the amount of space that anVolume: the amount of space that an
object or substance fills.object or substance fills.

11. VocabularyVocabulary
 Boil: to change from a liquid to a gas byBoil: to change from a liquid to a gas by
the application of heat; to reach the boilingthe application of heat; to reach the boiling
point.point.

12. VocabularyVocabulary
 Condense: to change from a gas to aCondense: to change from a gas to a
liquid; to make a gas change into a liquidliquid; to make a gas change into a liquid

13. VocabularyVocabulary
 Infiltrate: to pass slowly into something.Infiltrate: to pass slowly into something.
When rain soaks into the ground it isWhen rain soaks into the ground it is
called infiltration.called infiltration.

14. VocabularyVocabulary
 Precipitation: any form of water, such asPrecipitation: any form of water, such as
rain, snow, hail or sleet that falls to therain, snow, hail or sleet that falls to the
earths surface.earths surface.

15. VocabularyVocabulary
 Runoff: rain or water that runs off land intoRunoff: rain or water that runs off land into
streams and rivers.streams and rivers.

16. VocabularyVocabulary
 Transpire: When plants or leavesTranspire: When plants or leaves
transpire, water passes out from theirtranspire, water passes out from their
surface.surface.

17. Water can exist in three states:Water can exist in three states:
solid, liquid and gas.solid, liquid and gas.

18. SolidSolid
Solids can be picked up and handled. TheySolids can be picked up and handled. They
keep their shape unless you cut, slice orkeep their shape unless you cut, slice or
break bits off to make new and differentbreak bits off to make new and different
shapes.shapes.

19.  A solid has a definite shape and has aA solid has a definite shape and has a
definite volume.definite volume.
 Solid water is calledSolid water is called ice.ice.
 Ice has many uses in the real world.Ice has many uses in the real world.

20.  Ice can be used for sport or recreation.Ice can be used for sport or recreation.
Many people use ice to play ice hockey orMany people use ice to play ice hockey or
to practice figure skating.to practice figure skating.

21. Ice can be used to keep food fresh.Ice can be used to keep food fresh.
 If food is kept at a low temperature it willIf food is kept at a low temperature it will
stay fresh longer.stay fresh longer.

22.  Ice can be eaten.Ice can be eaten.
 Shaved ice mixed with fruit is a veryShaved ice mixed with fruit is a very
popular desert.popular desert.

23. LiquidLiquid
 Liquids are hard to control. You need toLiquids are hard to control. You need to
keep them in a container or they will glowkeep them in a container or they will glow
downward under the force of gravity.downward under the force of gravity.

24.  A liquid will change its shape to match theA liquid will change its shape to match the
shape of the container you put it in.shape of the container you put it in.

25.  A liquid has no definite shape but it has aA liquid has no definite shape but it has a
definite volume.definite volume.
 Liquid water is called waterLiquid water is called water
 Water can be used for sport or recreation.Water can be used for sport or recreation.
 Many people like to have fun at aMany people like to have fun at a
swimming pool.swimming pool.

26.  Water polo is a sport played in aWater polo is a sport played in a
swimming pool.swimming pool.
 We must drink water to stay alive.We must drink water to stay alive.

27.  A lot of water is used to grow the food weA lot of water is used to grow the food we
eat.eat.
 http://www.youtube.com/watch?v=bNOpNBw1http://www.youtube.com/watch?v=bNOpNBw1
 When water is supplied artificially to landWhen water is supplied artificially to land
for growing plants it is called irrigation.for growing plants it is called irrigation.

28. GasGas
 Most gases are invisible. The air aroundMost gases are invisible. The air around
us is made of a mixture of gases.us is made of a mixture of gases.
 A gas that is kept in a container willA gas that is kept in a container will
completely fill that container.completely fill that container.

29.  Any gas that is not in a container keepAny gas that is not in a container keep
sincreasing in volume, spreading furthersincreasing in volume, spreading further
and further.and further.
 A gas has no definite shape and noA gas has no definite shape and no
definite volume.definite volume.
 Water as a gas us calledWater as a gas us called water vaporwater vapor oror
steam.steam.

30. Making CloudsMaking Clouds
 http://www.youtube.com/watch?v=jIa9TcmhKdhttp://www.youtube.com/watch?v=jIa9TcmhKd

31.  We use steam for ironing clothes. SteamWe use steam for ironing clothes. Steam
makes it easier to get rid of creases.makes it easier to get rid of creases.

32.  We can use steam for cooking. It keepsWe can use steam for cooking. It keeps
more nutrients in the food.more nutrients in the food.