Focus Question: Where does water on a cup

come from?

Focus Question: Where does water on a cup

come from?

Water Planet 3-4Water Planet 3-4

ObservationsObservations

Observe both cups – sketch in your notebook

What do you see? How did water get onto

the outside of the cup? Where did the water

come from? Did water form on the

outside of both cups? Why?

Observe both cups – sketch in your notebook

What do you see? How did water get onto

the outside of the cup? Where did the water

come from? Did water form on the

outside of both cups? Why?

CondensationCondensationThe droplets of liquid water on the

outside of the cup came from the water vapor in the air. You are observing condensation.

Sometimes, when water vapor touches a cooler surface, it changes from water vapor gas to liquid water.When water evaporates, it changes

from liquid water to water vapor in the air.

The droplets of liquid water on the outside of the cup came from the water vapor in the air. You are observing condensation.

Sometimes, when water vapor touches a cooler surface, it changes from water vapor gas to liquid water.When water evaporates, it changes

from liquid water to water vapor in the air.

Real WorldReal WorldWater vapor in the air turns into a

liquid only when the temperature is cool enough.Ice water made the cup cool enough

for the water vapor in the air to condense and turn into liquid water.

Think of situations in your life when condensation occurs.Consider the source of the warm

water vapor and what made it cool enough to condense into liquid.

Water vapor in the air turns into a liquid only when the temperature is cool enough.Ice water made the cup cool enough

for the water vapor in the air to condense and turn into liquid water.

Think of situations in your life when condensation occurs.Consider the source of the warm

water vapor and what made it cool enough to condense into liquid.

Condensation ChamberCondensation ChamberMaterials - Dome lid, cup, post-it,

waterLabel cup with room/group #Use syringe to put 50 ml water in

dome lid.Put plastic cup on top to create

chamberSet chamber in a good evaporation

location (ex. Sunny windowsill)

Materials - Dome lid, cup, post-it, water

Label cup with room/group #Use syringe to put 50 ml water in

dome lid.Put plastic cup on top to create

chamberSet chamber in a good evaporation

location (ex. Sunny windowsill)

Chamber ObservationChamber ObservationRetrieve condensation chamberWhat do you see?~ make a sketch

in your notebookWhat made the water vapor

condense on the inside of the cup?What do you think would happen if

you created a colder surface for water vapor to condense on?

Retrieve condensation chamberWhat do you see?~ make a sketch

in your notebookWhat made the water vapor

condense on the inside of the cup?What do you think would happen if

you created a colder surface for water vapor to condense on?

Cold ExperimentCold ExperimentCreate a cold mixture of ice and

rock saltFill plastic cup with 1/2 cup iceMeasure 50 ml of rock saltPour salt over iceUse stirring stick to mix salt and

ice~Measure and record the

temperature in your cup.

Create a cold mixture of ice and rock salt

Fill plastic cup with 1/2 cup iceMeasure 50 ml of rock saltPour salt over iceUse stirring stick to mix salt and

ice~Measure and record the

temperature in your cup.

FrostFrostWhat do you observe?Why did frost appear on the cups?Water changes state from liquid to

solid ice at 0oC. Solid water called ice, snow, sleet,

frost.Frost on cup is water vapor that

condensed on cold surface of cup and froze. Cup surface is below the freezing point for water.

When else have you observed frost?

What do you observe?Why did frost appear on the cups?Water changes state from liquid to

solid ice at 0oC. Solid water called ice, snow, sleet,

frost.Frost on cup is water vapor that

condensed on cold surface of cup and froze. Cup surface is below the freezing point for water.

When else have you observed frost?

VocabularyVocabularyCondensation

The process when water vapor cools and becomes liquid water; such as when it contacts a cool surface.

FrostWater vapor that has condensed and

frozen on a surface below freezing.Freezing Point

The temperature at which water changes state from liquid to solid. Generally 0ºC or 32ºF.

CondensationThe process when water vapor cools

and becomes liquid water; such as when it contacts a cool surface.

FrostWater vapor that has condensed and

frozen on a surface below freezing.Freezing Point

The temperature at which water changes state from liquid to solid. Generally 0ºC or 32ºF.

ContentContent Where does the water that forms on the

outside of a cup of ice water come from?

What causes frost to form?

Your questions?

Homework - read Condensation pg 189-193, take 3-column notes & answer questions.

I-check 3 on Friday, 1/17.

Where does the water that forms on the outside of a cup of ice water come from?

What causes frost to form?

Your questions?

Homework - read Condensation pg 189-193, take 3-column notes & answer questions.

I-check 3 on Friday, 1/17.

Condensation ReadingCondensation Reading

What is condensation?What role does temperature play

in condensation?What is frost?Why does condensation form on a

glass of iced tea?

What is condensation?What role does temperature play

in condensation?What is frost?Why does condensation form on a

glass of iced tea?

Summary: Water VaporSummary: Water VaporWhat happens when liquid water

evaporates?What happens when water vapor

condenses?What is frost and how does it

form?

I-check quiz

What happens when liquid water evaporates?

What happens when water vapor condenses?

What is frost and how does it form?

I-check quiz