Lesson+Plan+7

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**Lesson Plan #7:**

Class project/ Experiment Evaporation and Condensation

Drawing from the previous lesson at the beginning of the unit development, in this lesson chidren will be drawing on thier prior knowlegde about evaporation and condensation and complete a variety of simple experiements to allow them to understand these processes.

=How to Explain the Process of Condensation to Children= At the start of the lesson, the teacher will explain the process of condensation to the children. Condensation is the opposite of the process called evaporation. In condensation, water vapor in the air slows down and turns back into a liquid. This can occur in the sky to create clouds or on a surface such as the exterior of a drinking glass. Teaching children about condensation will give them a strong foundation where they can branch off into learning about molecules, evaporation, steam and water cycles with greater ease.

Experiment Tell the children that they are going to learn about a process called condensation. Show the children four clear, empty, clean glasses. Place one empty glass in a refrigerator or freezer. Fill one glass in front of the children with cold water. Fill another glass in front of the children with the colored drink. Leave the last glass empty; this serves as the "control" glass. Leave these glasses alone for 10 to 15 minutes to allow the experiment time to take place. Read the "To the Mountains and Back: Drippy the Raindrop" online story to children. You can give give older children the option to read the story if they feel comfortable reading and have the skills to do so without much adult assistance. Explain the definition of condensation to the children. Write the word down so they can see how it is spelled. Pronounce condensation as you run your finger or pointer underneath the syllables to emphasize how to pronounce words properly. Ask children for examples of condensation. Discuss real-world applications and show pictures and illustrations if available. Show children pictures of condensation. Colorful images will capture their attention, and they will be more likely to commit the definition and condensation lesson to long-term memory. Put all the experiment glasses on a table in front of the children, each glass about 12 inches apart so the results are not compromised by a cool glass being too close to a room temperature glass. Each child will be given a sheet already drawn up by the teacher so they can record the results. Teacher then asks children to explain the findings.
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Ask children how they think the water got on the outside of the glass with cool water. Smaller children might answer "condensation" or "from the inside of the glass" or "that the water crawled out of the glass onto the other side."

Show children the glass with the cool coloured ink on the outside. Explain that if the liquid "transferred" or "crawled out" then it would not be clear. Show children the empty cool glass from the refrigerator or freezer. Remind the children that this glass started with no liquid inside and also had condensation, this will also illustrate that the water does not "leak through" or "crawl out." Now the teacher will explain to the children the process of condensation in terms they understand, illustrating the explanation using the glasses including the control glass (this one has not changed). Write any words relating to condensation on the board such as water, glass, H20, cool, warm, temperature, control, experiment and other related terms will be appropriate and help them to learn to spell science words. Wrap up the lesson with a video that illustrates condensation as a review. Eureka! Episode 18 - Evaporation and Condensation is a good example of a video that can be used to wrap up the condensation lesson.
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Things You'll Need:
 * 4 clear water glasses, cold water, colored ink, freezer, crayons markers, colored pencils, digital camera (optional for taking pictures of the experiment steps).

1st Experiment Steaming Up
 * Matter Experiment**

1. Take a deep breath. 2. Get real close to the mirror or window with your mouth. 3. Open your mouth and exhale your hot breath onto the mirror or window.
 * Steps:**

What has happened to the mirror or window? It has steamed up or you could call it condensation. Why do things steam up? If you breathe on a mirror or window, it will steam up. Your breath contains water –although you can’t see it. The water is a type of gas, called a vapor, which is mixed with the air. When the water vapor from your breath hits the cold mirror or window, some of it turns into a liquid. Thousands of tiny droplets of water form on the mirror or window, and this is called condensation or steam. You may have seen steam or condensation in the kitchen, the bathroom or in a car on a cold day. You can see this steam or condensation in mid-air when you watch a kettle or a pan of water boil. Hot water vapors are given off by the water. The vapor cools when it meets cooler air and then turns into tiny (dew) drops, which forms the steam or condensation.

Experiment 2. =Evaporation Experiment=
 * Materials**
 * 1) 2 clear plastic cups
 * 2) Felt marker
 * 3) Clear plastic wrap
 * 4) Water

Partly fill the plastic cups with water so that they both have the same level of water. Mark the levels with the marker. Seal one of the cups with plastic wrap. Leave it for a day. Look at both cups and get the children to mark where the water levels are. Continue to do this for a few more days, marking the levels each day and noting any change. The children will notice that the water level goes down in the cup that has no cover. Where does the water go? Talk about the water disappearing and explain what evaporation is.
 * Directions**

Experiment 3. Why do wet clothes dry more quickly in the sunshine as opposed to a dark, damp room? Sun - Clothes dry much quicker in the warm sunshine because the water is evaporated. Evaporation is when the liquid (water) is turned into a vapour and the water disappears.
 * Drying Clothes **

When water is warm it evaporates much quicker than when water is cool. Therefore, the heat from the sun helps to dry clothes quickly. Wind - Another drying factor is the wind. If it is a windy day the water is evaporated more quickly due to the air moving/passing through the clothes. Once the children have completed these experiment they will come back into class and with the teacher have a group discussion about what they have learnt and their new findings.

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[|Evaporation.JPG]