This is a simple, fun, extremely noisy experiment that will teach you a little bit about sound. All you’ll need are a straw and some scissors!
First, make a straw into a reed-like instrument by flattening one end and cutting off either side near the tip so that it looks like an arrow, but leave a small, flat area between the angled cuts (see photos.)
Now, put your lips around the straw, past where the point is, and blow hard. Be careful not to completely flatten the straw or air can’t go through. As the ends of the straw vibrate, they cause the air inside the column-shaped straw to vibrate, creating sound waves. The longer the column, the lower the sound, since longer sound waves sound lower! The shorter the column, the higher the sound.
Your straw instrument should sound like something between a squeaky oboe and a duck call.
Try making different length straw instruments.
This fun activity will teach you a little bit about rockets. It is from one of NASA‘s educational websites and the great rocket template you’ll find below is provided by the Jet Propulsion Laboratory at the California Institute of Technology.
All you’ll need is a plastic soda straw, some paper, scissors and tape. For the body of your rocket, you can use this template or simply cut a strip of paper an inch or two wide. If using the template, wrap the rectangle of paper around a pencil and tape it into a tube. If you’re using a strip of paper, wind it around a pencil (as pictured above) so it forms a tube. Tape it well, so it holds its shape.
Now, remove your rocket from the pencil, fold one end over and tape it down. This will be the nose of your rocket. To the other end, you can make fins using the template, or design your own fins to tape on. Fins work best at right angles, or near right angles. Now you can decorate your creation.
Put your rocket over the end of a straw and use the force of your breath to launch it! How far does it go? Try making longer and shorter rockets. What happens if you change the shape or number of fins? Record your flight lengths.
What does this teach you? Paper rockets demonstrate how real rockets fly through the atmosphere and some of the forces working on them!
Drag is the force of air getting in the way of your rocket. Weight also drags your rocket down as gravity pulls on it. The lighter you make your rocket (less paper, less tape), and the less drag it has, the farther it will go!
Fins stabilize the rockets’ flight. The size and design of the fins affect how well it can be controlled.
It’s fun to bring a little science into the holidays! Here are three fun projects from my new book Sheet Pan Science. Click here to watch the segment and learn to make Ice Globe Volcanoes, Epsom Salt Crystal Ornaments and Gelatin Window Stickies.
For more detailed instructions, more science and more sheet pan science, click here to order the book ($19.99) from Amazon, here to order from other online retailers or grab a copy at your favorite brick and morter bookstore!
Turn your kitchen table into the coolest mad science lab in the neighborhood. Click on the project name for a link to instructions and to read about the “Science Behind the Fun.” Most of these projects can be found in my book “Kitchen Science Lab for Kids,” if you’re looking for the perfect gift for any young scientist!
1. Frankenworms– Bring gummy worms to “life” using baking soda and vinegar.
2. Alien Monster Eggs– Make creepy, squishy monster eggs.
3. Oozing Monster Heads– Combine science and art to create Halloween fun.
4. Bag of Blood– Amaze your friends with this magical science trick.
9. Magic Potion– Make a color-changing, foaming potion using red cabbage and water.
10. Halloween Soda Explosion– The classic Diet Coke and Mentos explosion is perfect for Halloween.
11. Foaming Alien Blood– Bring the X-Files to your kitchen with this creepy green fake blood
12. Mad Scientist’s Green Slime– Because everyone loves slime
13. Homemade Fake Blood– It’s simple to make non-toxic fake blood in your kitchen.
14. Fizzy Balloon Ghosts– Draw scary faces on balloons and inflate them using baking soda and vinegar.
I’m thrilled that the third book of my Kitchen Pantry Scientist series will be released on Feb.8th and is available for order everywhere books are sold (link here.)
Yesterday, I went on Twin Cities Live to demonstrate some projects from the book and show some videos of whales, whale sharks, plankton and scorpions from a trip I just took to Baja Sur in Mexico. Watch the short segment here!
Use science to make your holidays shine! Here are a few fun ornaments adapted from projects in my book “STEAM Lab for Kids.” Basic instructions can be found below. Buy your own copy of “STEAM Lab for Kids” anywhere books are sold to learn more about the “Science Behind the Fun!” Happy Holidays!
LED Ornaments and Jar Globes:
To make LED ornaments, buy plastic jars or ornaments with removable bases. Use sculpting clay (the kind that won’t harden) to design a scene and add LEDs connected to a coin-cell battery to light your creation. LEDs can be ordered online. See images below.
Epsom Salt Crystal Ornaments:
(Warning: Hot liquids require adult supervision.) To make the Epsom Salt crystals, dissolve 3 cups of Epsom salts in 2 cups of water by heating and stirring until no more crystals are visible. This creates a supersaturated solution. Allow the solution to cool slightly. Hang pipe cleaners formed into snowflakes in jars or hollow ornaments and pour the solution in. When long, needle-like crystals have formed, remove the pipe cleaners from the jars. You can leave them in the ornaments, and drain the liquid.
Gelatin is the substance that makes Jell-O jiggle. See what happens when food coloring molecules move, or DIFFUSE through Jell-O.
This creative science experiment that my kids and I invented lets you play with floatation physics by sprinkling glitter on melted gelatin, watch colorful dyes diffuse to create patterns and then use cookie cutters to punch out sticky window decorations. Water will evaporate from the gelatin, leaving you with paper-thin “stained glass” shapes.
-plain, unflavored gelatin from the grocery store or Target
–a drinking straw or toothpicks
*You can use the recipe below for two pans around 8×12 inches, or use large, rimmed cookie sheets for your gelatin. For a single pan, cut the recipe in half.
Step 1. Add 6 packs of plain, unflavored gelatin (1 oz or 28 gm) to 4 cups of boiling water. Stir well until all the gelatin has dissolved and remove bubbles with a spoon.
Step 2. Allow gelatin to cool to a kid-safe temperature. Pour the liquid gelatin into two large pans so it’s around 1-1.5 cm deep. It doesn’t have to be exact.
Step 5. In the pan with no glitter, use a toothpick dipped in food coloring to make designs in the gelatin. Alternately, use straw to create holes in the gelatin, a few cm apart, scattered across the surface. It works best to poke a straw straight into the gelatin, but not all the way to the bottom. Spin the straw and remove it. Then, use a toothpick or skewer to pull out the gelatin plug you’ve created. This will leave a perfect hole for the food coloring. Very young children may need help.
Step 6. If you poked holes with a straw, add a drop of food coloring to each hole in the gelatin.
Step 7. Let the gelatin pans sit for 24 hours. Every so often, use a ruler to measure the circle of food coloring molecules as they diffuse (move) into the gelatin around them (read about diffusion at the bottom of this post.) How many cm per hour is the color diffusing? Do some colors diffuse faster than others? If you put one pan in the refrigerator and an identical one at room temperature, does the food coloring diffuse at the same rate?
Step 8. When the food coloring has made colorful circles in the gelatin, use cookie cutters to cut shapes from both pans of gelatin (glitter and food coloring), carefully remove them from the pan with a spatula or your fingers, and use them to decorate a window. (Ask a parent first, since some glitter may find its way to the floor!) Don’t get frustrated if they break, since you can stick them back together on the window.
Step 9. Observe your window jellies each day to see what happens when the water evaporates from the gelatin.
When they’re dry, peel them off the window. Are they thinner than when you started? Why? Can you re-hydrate them by soaking the dried shapes in water?
The Science Behind the Fun:
Imagine half a box filled with red balls and the other half filled with yellow ones. If you set the box on something that vibrates, the balls will move around randomly, until the red and yellow balls are evenly mixed up.
Scientists call this process, when molecules move from areas of high concentration, where there are lots of other similar molecules, to areas of low concentration, where there are fewer similar molecules DIFFUSION. When the molecules are evenly spread throughout the space, it is called EQUILIBRIUM.
Lots of things can affect how fast molecules diffuse, including temperature. When molecules are heated up, they vibrate faster and move around faster, which helps them reach equilibrium more quickly than they would if it were cold. Diffusion takes place in gases like air, liquids like water, and even solids (semiconductors for computers are made by diffusing elements into one another.)
Think about the way pollutants move from one place to another through air, water and even soil. Or consider how bacteria are able to take up the substances they need to thrive. Your body has to transfer oxygen, carbon dioxide and water by processes involving diffusion as well.
Why does glitter float on gelatin? An object’s density and it’s shape help determine its buoyancy, or whether it will float or sink. Density is an object’s mass (loosely defined as its weight) divided by its volume (how much space it takes up.) A famous scientist named Archimedes discovered that any floating object displaces its own weight of fluid. Boats have to be designed in shapes that will displace, or push, at least as much water as they weigh in order to float.
For example, a 100 pound block of metal won’t move much water out of the way, and sinks fast since it’s denser than water. However , a 100 pound block of metal reshaped into a boat pushes more water out of the way and will float if you design it well!
What is the shape of your glitter? Does it float or sink in the gelatin?
Here’s a video I made for KidScience app that demonstrates how to make window gellies
Credit: My 11 YO daughter came up with the brilliant idea to stick this experiment on windows. I was just going to dry out the gelatin shapes to make ornaments. Kids are often way more creative than adults!
From surface tension to evaporation, science come into play every time you blow a bubble. Here’s some bubble science, along with a recipe for making giant bubbles from my book Outdoor Science Lab for Kids!
Water molecules like to stick to each other , and scientists call this sticky, elastic tendency “surface tension.” Soap molecules, have a hydrophobic (water-hating) end and (hydrophilic) a water-loving end and can lower the surface tension of water. When you blow a bubble, you create a thin film of water molecules sandwiched between two layers of soap molecules, with their water-loving ends pointing toward the water, and their water-hating ends pointing out into the air.
As you might guess, the air pressure inside the elastic soapy sandwich layers of a bubble is slightly higher than the air pressure outside the bubble. Bubbles strive to be round, since the forces of surface tension rearrange their molecular structure to make them have the least amount of surface area possible, and of all three dimensional shapes, a sphere has the lowest surface area. Other forces, like your moving breath or a breeze can affect the shape of bubbles as well.
The thickness of the water/soap molecule is always changing slightly as the water layer evaporates, and light is hitting the soap layers from many angles, causing light waves to bounce around and interfere with each other, giving the bubble a multitude of colors.
Try making these giant bubbles at home this summer! They’re a blast! (It works best a day when it’s not too windy, and bubbles love humid days!)
To make your own giant bubble wand, you’ll need:
-Around 54 inches of cotton kitchen twine
-two sticks 1-3 feet long
-a metal washer
1. Tie string to the end of one stick.
2. Put a washer on the string and tie it to the end of the other stick so the washer is hanging in-between on around 36 inches of string. (See photo.) Tie remaining 18 inches of string to the end of the first stick. See photo!
For the bubbles:
-6 cups distilled or purified water
-1/2 cup cornstarch
-1 Tbs. baking powder
-1 Tbs. glycerine (Optional. Available at most pharmacies.)
-1/2 cup blue Dawn. The type of detergent can literally make or break your giant bubbles. Dawn Ultra (not concentrated) or Dawn Pro are highly recommended. We used Dawn Ultra, which is available at Target.
1. Mix water and cornstarch. Add remaining ingredients and mix well without whipping up tiny bubbles. Use immediately, or stir again and use after an hour or so.
2. With the two sticks parallel and together, dip bubble wand into mixture, immersing all the string completely.
3. Pull the string up out of the bubble mix and pull them apart slowly so that you form a string triangle with bubble in the middle.
4. Move the wands or blow bubbles with your breath. You can “close” the bubbles by moving the sticks together to close the gap between strings.
What else could you try?
-Make another wand with longer or shorter string. How does it affect your bubbles?
-Try different recipes to see if you can improve the bubbles. Do other dish soaps work as well?
-Can you add scent to the bubbles, like vanilla or peppermint, or will it interfere with the surface tension?
-Can you figure out how to make a bubble inside another bubble?
If you have balloons, straws and string, you can send a balloon rocket shooting up a string to watch Newton’s third law of motion in action. As the air escapes the balloon in one direction, it sends the balloon rocket in the opposite direction! Art lovers will have fun making beautiful evaporation rings using vinegar, food coloring and cornstarch, and if you’re into engineering, order a small motor and some alligator clips to make a bristle robot!
Thank you, Tom Gross (from coffeewithkenobi.com) and Kaleigh!