Magical Plastic Bag Experiment

Polymer Science Project for Kids that Feels like Magic. So simple. Easy to do at home. via TinkerLab

Here’s a fun experiment that won’t take a lot of time, and it’s more than likely that you have all the “ingredients” around the house. I did this with my three and a half year old, and it would be relevant for preschoolers and elementary-age children.

The idea that we’re testing here is what will happen if we poke a sharp pencil through a plastic bag of water. Will the water leak through the holes? Will the water spill out? Or will the bag reseal around the pencils, keeping the water inside?

When my 3-year old daughter (N) and I tried this out, we worked with the question, “what will happen if we poke pencils into a bag full of water?” That seemed more age-appropriate and tangible for her.

Magical Plastic Bag Experiment | TinkerLab

Supplies

  • Zip-up Bag
  • Water
  • Sharpened Pencils

We filled a zip-up bag about half-way with water and sealed it up. I held the bag high over a sink and N poked the pencils straight through the bag, from one side to the other. This is where my fancy photography skills come into play, holding the bag with one hand and snapping a photo with the other. Are you impressed?

Make sure that the pencil doesn’t keep traveling through the bag or you’ll have water leaks.Magical Plastic Bag Experiment | TinkerLab

Magical Plastic Bag Experiment | TinkerLab

Keep adding pencils until you’ve had enough. Before removing the pencils, take a moment to talk about what you see. When the pencil goes into the bag, the bag seems to magically seal itself around the pencil.

Magical Plastic Bag Experiment | TinkerLab

When you’re done, remove the pencils over a sink.

The Science Behind the Experiment

Plastic bags are made out of polymers, chains of molecules that are flexible and give the bag its stretchiness. When the sharp pencil pokes through the bag, the stretchy plastic hugs around the pencil, creating a watertight seal around the pencil…and the bag doesn’t leak.

Magical Plastic Bag Experiment | TinkerLab

More Polymer Fun

Now I’m really excited for us to try poking skewers through balloons without popping them (QuestaCon Science Squad) and make our own kazoos from toilet paper rolls and plastic bags (Kazoologist). Steve Spangler Science is also an amazing place to go for projects like this, and you’ll find endless polymer-related ideas over there.

You could also make your own polymer by mixing up a batch of fun and flubbery Gak (a mixture of water, white glue, and borax). We’ve done this multiple times, and my kids can’t get enough of it.

More Science Projects for Kids

If you enjoyed this project, you’ll love this article: Science Fair Project Ideas.

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Is it Magnetic? Testing Objects for Magnetism.

How was your weekend? We took a mini-vacation to play in the snow and I enjoyed a little computer break along the way. I thought I could get online with my phone, but it turned out that the reception was horrible and I’ve been completely out-of-touch! It was probably a good thing, as I could really focus on my family and be as rested as possible when my one-year old woke up, inconsolable, for 2 hours in the middle of the night! I also want to formally thank my good friend Melissa from The Chocolate Muffin Tree who checked in to make sure I was okay! How lucky am I?

I’ve been on a science kick lately. Maybe because my 3-year old is completely self-serve in the art department or maybe because I’ve checked every science for kids book out of our local library? If you’re in the market for a great book of kids science experiments for ages 8 and up, I checked out The Science Explorer Out and about: Fantastic Science Experiments Your Family Can Do Anywhere (Science Explorer Out & about)and it’s phenomenal. It was written in 1997 and looks a little bit dated, but the concepts are solid and it stands the test of time. If you’ve ever been to San Francisco’s Exploratorium or if you’re familiar with their publications, you’ll feel connected to this book.

magnet and water experiment materials

Today’s experiment is similar to one we’ve done before with paper clips +magnets (Traveling Magnets), and this takes it up a notch with a few more magnet surprises and discoveries. Here’s what you’ll need…

Materials

  • Glass or vase of water. Thin glass works better than thick.
  • Pipe cleaners and/or paper clips
  • Strong magnets
  • Scissors
  • Small magnetic and non-magnetic objects

pipe cleaners in water experiment

Cut the pipe cleaners up and add them to the vase of water and mix them up so the pipe cleaners sink. Three-year old N loved doing this step herself.

Using your magnet/s try to pull the pipe cleaners up the side of the vase. Once they reach the top, you can retrieve them or drop them back in.

It’s like fishing!

testing magnets experiment kids

This opened up a conversation about what would stick to the magnets, so I pulled out a handful of small metal and non-metal objects for us to test.

Meanwhile, my 1-year old enjoyed stirring the water and fishing pipe cleaners out with her hands.

testing magnets experiment kids

N understood that the magnet would only stick to metal and quickly ruled out rubber bands and post-it notes from the “Is it magnetic?” list, but we also learned that the magnet wouldn’t stick to ALL metals.

And that was a surprise!

magnets on hardwood floor nails

One of the funnest surprises, however, was when a magnet fell onto the floor and stuck to a hidden nail! We dropped the rest of our magnets onto the floor and flicked them from nail to nail, watching them dance from floorboard to floorboard.

One more thought — I kept a close eye on my 17 month old throughout because our magnets are so tiny — just a thought that you might want to do the same or find some big magnets for the under 3 y.o. crowd.

What did your weekend look like? Have you been able to take a technology break? And have you had any fun magnet discoveries?

 

 

Science Projects for Kids | Yeast and Sugar Experiment

Science Projects for Kids | Yeast and Sugar ExperimentIn this Yeast Sugar Experiment, we’ll watch yeast feed on sugar to fill a balloon with air. A fun science project for kids that’s with household, everyday materials.

How we got started

I’ve been baking bread just about every day for the past three weeks (nothing too crazy since it’s all done in the bread maker), but last week my 3.5 year old and I got into a discussion about the properties of yeast.

We like to tinker and  experiment — big surprise, I know — and decided to see what would happen if we mixed yeast with warm water.

My preschooler took this job very seriously, poured the water into a bowl, added a couple teaspoons of yeast, and waited a few patient minutes before she said, “it makes a brownish color.” True, and to make it bubble like it does in bread, we needed to activate it with sugar.

What’s so great about an experiment like this is that it’s easy to do with household materials, and it’s ripe for authentic child-generated questions and observations. When I asked what she thought would happen if we added sugar to the yeast she said, “I don’t know! Let’s mix them and find out!.”

In this Yeast Sugar Experiment, we'll watch yeast feed on sugar to fill a balloon with air. A fun science project for kids that's with household, everyday materials.

Supplies: Yeast Sugar Experiment

  • Sugar, 2 tablespoons
  • Active Dry Yeast, 1 packet or 2 1/4 tablespoons
  • Balloon
  • Warm water (105-115 degrees F, 40.5-46 degrees C)
  • Mixing bowl + funnel
  • Bottle that you can fit a balloon over

Science Projects for Kids | Yeast and Sugar Experiment

Mix the yeast and sugar into the warm water and stir. I noticed that N was sniffing the concoction and asked her what it smelled like. She said “poop.” I could see what she was saying. Consider yourself warned.

Once it all dissolves, pour the mixture into the bottle and cover the bottle with the balloon.

Science Projects for Kids | Yeast and Sugar Experiment

After a few minutes you’ll be amazed by something like this!

Science Projects for Kids | Yeast and Sugar Expriement

Will it blow off the bottle?

N wanted to feel it as it filled with air. She noticed the balloon was getting bigger and wanted to know how big it would get, wondering out loud, “will it fill up all the way and blow off the bottle?”

Good question!

Science Projects for Kids | Yeast and Sugar Experiment

My handy-dandy ship captain sister (no joke — that’s her job!) was visiting, and put herself right to work as chief measurer.

Science Projects for Kids | Yeast and Sugar Experiment

Move it to a safe spot

Once the bottle filled up completely, we moved the whole yeast sugar experriment to the sink. The bubbles were slow-moving, and there was nothing to worry ourselves with, but N enjoyed pulling the balloon off and watching the foam slowly pour over the bottle’s top.

Science Projects for Kids | Yeast and Sugar Experiment

More ideas for the Yeast Sugar Experiment

As we went through the process, I thought of a few fun extensions for older kids or those who want to take this further. You could play around with food coloring/liquid watercolors, have a few bottles going at once and compare the results of different sugar:yeast ratios, or compare the results of different water temperatures.

I found my recipe at The Exploratorium’s Science of Cooking series, where we also learned that as the yeast eats the sugar it makes carbon dioxide, which is essentially the same process that yeast goes through in our bread dough.

Mmmmm. I’m off to eat some whole wheat cranberry walnut oat bread. Toasted. With butter and Maldon salt. How do you like your bread? And have you played around with yeast concoctions?

More Science Experiments for Kids

If you enjoyed this project, you’ll love this article: Science Fair Project Ideas.

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Growing Gummy Bear Experiment

Do you know about the growing gummy bear experiment? It takes very little room, isn’t messy, and kids love it!

The incredible growing gummy bear experiment | TinkerLab

Here’s how we landed on this experiment…

My kids and I stopped at the drug store for baby wipes, and my 3.5 year old bombarded me with five minutes of excitement that sounded like this, “Mom, stop! You have to see this. Mom, can you get me this light up candy cane/cup shaped like a fairy/snow globe. Wait!!! I really want it!” Ugh. Why do stores have to put all their bling at child height?

I normally adore her enthusiasm, but I have a short wick for the begging and pleading for random odds and ends. Pair that with a one-year old who insists on standing in the shopping cart and you get the picture of me yearning for a hot cup of coffee and a trashy magazine.

In my mom-haze I accidentally walked us down the candy aisle on the way to check out. Dumb move, I know, and my older daughter quickly managed to pull a bag of gumdrops off the display with a request to make gumdrop sculptures. 

Ack. She knows my weak spot for creative projects!

Um, yes, we can buy the gumdrops for the sake of your growing mind. And with that, she also pulled down a pack of gummy bears. I remembered reading about a gummy bear experiment, and that’s how we ended up bringing these little jelly woodland creatures home with us.

The experiment is easy.

Supplies: Gummy Bear Experiment

  • Gummy Bears
  • Water
  • Bowl

Directions

Add a gummy bear to water. Check on it after a couple hours and compare its size to the original gummy bear. See what happens if you leave this in the water for one day, two days, and three days.

Experiment Ideas

  • Set up a number of bowls and place one gummy bear in each one. Add different liquids to each bowl (water, soda, vinegar, etc.) and see how or if the solutions change the results.
  • Document the changing scale of the gummy bears with drawings or photographs.
  • Compare the taste of the plump bears with the original bears.

How we ran this experiment

My older daughter and I each had to eat one, of course, we chose a couple to add to the water. I asked her what she thought might happen to them after being submerged, and she said she didn’t know. After a couple hours we checked on them, and found them covered in tiny bubbles. We compared them to one of the dry originals, and the wet bears were a bit plumper!

I left 3.5 year old N in the kitchen while I put her baby sister down for a nap, and returned to find her nibbling on one of the plump bears!! She had this to say, “I know I wasn’t supposed to eat the bear, but I had to also compare the way they taste to see if they tasted the same.” How could I be upset with that?

In all, we let the bears sit in water for three days, and you can see the size difference in this image. The gummies kept expanding and then finally seemed to fall apart.

If you try this at home, and want to do a taste comparison, be sure to refrigerate your gummy bears so they don’t grow bacteria. Yikes!

The Science behind the Experiment

Gummy bears are made up of water, sugar, and gelatin. Like a sponge, gummy bears will absorb water but the gelatin keeps the bears from dissolving in the water.

More Science Inspiration

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In case you blinked and missed it, TinkerLab rounds up all the great stuff on the internets on keeping you and your critters creative and wraps it up for you in a tidy newsletter! (And throws in some secret giveaways for good measure!)  – Yuliya P., San Francisco, CA

Join our community and you’ll learn:

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Science Experiment: The Floating Egg

As I hovered the egg over a jar of water, I asked my 3.5 year old, “Will it sink or float?”and it reminded me of Dave Letterman’s funny sketch, “Will it Float?” Have you seen it? This science experiment is really easy to set up + clean up, and the lesson learned on the density of water actually stuck with my 3-year old daughter long after the experiment was over. Fun and success!

The set up

  • One egg
  • Clear container: I used a wide jar, but a tall glass would work and you won’t need as much salt
  • Water
  • A few cups of salt
  • Spoon to mix the solution

Step #1:

Place the egg in plain water and talk about whether or not it floats. Pretty simple — it most definitely sinks!

Step #2:

Start adding salt to the water. We added ours little by little, and tested the solution by adding the egg back into the water. My 3 year old poured while my 1-year old mixed. I love these moments when they work and play side-by-side.

Finally, it floats!

Baby Rainbow loved this step, as she could finally reach the egg, and had some fun picking it up and dropping it back into the water where it “bounced.”

The Science behind the Experiment

The egg won’t float in regular water because it’s heavier than the water. But adding salt to the water makes the water more dense than the egg, and it floats! We have a book called “Let’s Visit Israel,” and my 3-year old will talk about this phenomena when we reach the page about floating in the Dead Sea.

Taking it one step further

Steve Spangler Science has a great idea for dragging this out into one more step. Fill half of a tall glass (that an egg will fit in) with this salty solution and then slowly pour plain tap water down the sides of the glass, being careful not to mix the two solutions. Gently drop the egg in the solution and watch it sink past the plain water, only to stop on top of the salty water! How cool is that?!

Do you have a favorite science experiment?

This post is shared on It’s Playtime.