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Water: States of Matter. By: Cammie Goodman. Icicles , raindrops, an invisible gas in the air—these are all forms of water. Water can be a solid, a liquid, or a gas . Water can also change from one of these forms to another. States of Matter.

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water states of matter

Water: States of Matter

By: Cammie Goodman

icicles raindrops an invisible gas in the air these are all forms of water
Icicles, raindrops, an invisible gas in the air—these are all forms of water.
  • Water can be a solid, a liquid, or a gas.
  • Water can also change from one of these forms to another
states of matter
States of Matter

Matter is anything that takes up space and has weight

  • Exist in different physical forms, called states. (solids, liquids, gases)
water is a kind of matter that is found in nature in all three states
Water is a kind of matter that is found in nature in all three states.

Earth’s water is found in the liquid state in oceans, lakes, and rivers.

  • Frozen water or ice is in the solid state.
  • Frozen water is found in the polar ice caps and in large ice sheets called glaciers.
slide8

Water in its gas state is called water vapor.

  • Water vapor is one of the gasses in the air.
slide9

Earth’s water changes state: glaciers melt, dripping water forms icicles, puddles dry up and water vapor becomes drops of dew.

melting
Melting
  • Melting is the change of matter from a solid to a liquid.
  • When enough heat energy is added to the solid ice cubes, they melt.
  • Heat makes the particles of frozen water move faster and farther apart. The solid becomes liquid water.
  • When heat energy is added to matter, it gets hotter. Its temperature rises.
  • Temperature is a measure of how much heat energy and object has.
evaporation
Evaporation

Evaporation is the change of matter from a liquid to a gas.

  • When a liquid changes to a gas, we say it evaporates.
  • If you heat a pot of water on a stove, the water particles start to move faster, as they move farther apart.
  • When the temperature of the water reaches 100˚C, the water boils, or forms bubbles of gas.
evaporation1
Evaporation
  • Water does have to boil to evaporate. Evaporation can happen at different temperatures, when water particles get enough heat energy. Then those particles leave the liquid water and go in the air as a gas—water vapor.
  • Evaporation happens faster when temperatures are high. When liquid water begins to boil at 100˚C, it evaporates quickly.
slide13

You may see a cloud of “steam” rising from a pot of boiling water. What you see is not water vapor. Water vapor is a clear, colorless gas. The cloud is a mist, made up of tiny droplets of liquid water that condense from water vapor.

condensation
Condensation
  • Condensation is the change of matter from a gas to a liquid.
  • When a gas changes to a liquid, we say it condenses.
  • If it is a hot sunny day and you have a cold glass of water filled with ice cubes. You notice that drops of water form on the outside of the glass. The drops form as water vapor in the air condenses on the cold glass.
slide15

When water vapor loses heat, its particles move more slowly. They move closer together. The water vapor changes to liquid water.

  • When liquid water gets cold enough, it freezes.
  • Freezing is the change of matter from a liquid to a solid.
  • As liquid water loses heat energy, its particles move more slowly. If the water loses enough heat, it becomes a solid—ice.
  • Water freezes at 0˚C
discussion question
Discussion Question:

When the air cools at night, the drops of water called dew form on the grass. How do the drops form? Why do they disappear during the day?

lesson review
Lesson Review
  • What is the change of gas to a liquid called?
    • Evaporation
    • Condensation
    • Melting
    • Freezing
slide18

2. Which statement BEST describes what happens to water when it changes state from a liquid to a solid?

  • Its particles begin to move faster
  • Its particles do not move at all
  • Its particles evaporate
  • Its particles move more slowly.
slide19

3. What happens to water when it evaporates?

  • It becomes a solid
  • It becomes droplets
  • It is no longer matter
  • It becomes a gas.
slide20

4. What happens to liquid water at 0˚C?

  • It becomes a solid
  • It becomes air
  • It does not change
  • It becomes a gas.