Water evaporation can be a "misty-fying" subject.

Do you know what water evaporation is? If not we're going to learn about it today. This science fair project deals with what happens to water as it sits over time.You may think this sounds as exciting as watching grass grow...

...but trust me. It's much more exciting. Just watch!

Time - Give yourself about one to two weeks to do this one.

Stuff List

You'll need...

1. Three washcloths (exact same size, color and shape)
2. Bucket or pan of water
3. Sunshine!
4. Hanger or clothesline and clothespins
5. Graph paper
6. Camera
7. Cardboard for display (three sided)
8. Glue
9. Paper
10. Computer (optional)


It's always important to ask questions. In science it's even more important. So...

...let's ask some questions about water evaporation.

Here are some important questions to get you started. These aren't the most important question, though. We'll ask that one later.

See if you can add to this list for this water evaporation experiment.

How do clothes dry on a clothesline?
Where does water go after it evaporates?
What is the water cycle?

Try to answer these as best you can.


We ask the most important question...

Which will dry faster, a wadded cloth, one that is laid flat or a cloth hung on a clothesline?

This is a good question because we can try it out in our backyard. But don't try it yet. We need to answer our important question first!

Let's do that now.

What do you think will happen?

Write it down on a piece of paper. Don't change it until you see what the experiment does first. We call this guess our hypothesis.

Now it's time to get your stuff from the list above. Let's move to the next step.


Now comes the fun part...

...let's experiment! Place all three washcloths in your bucket or pan of water. Squeeze each rag lightly so that the rags aren't dripping water everywhere. Try to get each one equally dry. Have an adult help you with this step if you need help.

Now place one wadded in the sun, one laid out flat and one hanging on your clothesline. It should look something like this...

Help me! I'm wadded!

This is the life!

I've been strungup!

Check each hour to see how each rag is doing. Make sure you write down what you see. Also make sure to watch to see which one dries the fastest. A chart may help you keep track of what is happening. You may want to make it something like this...

Don't forget to take lots of pictures of this part. Pictures show you did your own work.

Also, don't forget to check your rags. If you forget, you may ruin the project! Ask your mom for a kitchen timer to keep track of the time or have an adult keep an eyen on the clock for you. But either way...

Be careful!



...let's make the graph!

Take your graph paper and put hours down the side. Now write "Wadded", "Flat" and "Hung" at the bottom. Fill it in with the information you put on your chart. It should look something like this...


It's time to tell what you've noticed. Write a report about what you saw.

You should include...

1. What you guessed about the rags.
2. What you did with the rags.
3. Which rag dried the fastest.
4. If your guess was correct about the rags.

Be careful to obey all the school rules for your science fair report. Three or four sentences will do if you weren't given how long it should be.


Now you get to make the display!

Carefully put three pieces of cardboard together so it looks like this...

If you want more information about how to put together and arrange displays click here.

You can buy displays at many retail stores as well. However you do it, make sure you follow science fair rules!

Now, on a piece of paper neatly write your important question and your guess. If you would like, type it. You might get style points!

Now, just like you did your important question, write (or type) your supply list on a separate piece of paper.

Paste your guess, supply list and report onto your display board along with any pictures you might have taken. Make sure you label each so the judges know what is what. Making sure everything looks good is important!

If you want to get some ideas for your display we have some examples for you. Just click here for examples of experiment displays that you might want to use for your water evaporation experiment.

Try playing with some of the display ideas you see. You don't have to use the exact ones we use. Make them fun! Be creative!

And don't forget to name your project at the top of the display board. You may want to use your important question as the title. You may want to purchase stencils to make cutouts of letters. Or you may purchase already made letters at many retail stores.

Whatever you do, have fun!

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