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Dancing Droplets of water experiments (Leidenfrost Effect)

Why does a droplet of water not boil off immediately when we put it on a super hot pan? When the pan surface is clean and very hot the water underneath the droplet boils instantly and create a thin layer of steam under the drop. This layer of steam insulates the cold water from the hot pan and the hot pan from the cold water, the heat transfer is reduced considerably.   A tiny graphic pops up for a very short time that illustrates this leidenfrost effect, if you blink you miss it.   The underlying physics of the effect?…

Ice and Oil physics Experiments

Both oil and ice can be slippery, but this is where the similarity ends. Oil and ice have very little in common. Actually, oil doesn’t like ice and especially melted ice.   You notice the ice cube goes down to the veggie oil layer as heavier then the baby oil. Oil is known as hydrophobic, meaning that it repels water. When you put the ice cube in the oil it begins to melt. It doesn’t mix with the oil because oil is hydrophobic. This explains why the oil and water don’t blend together, but this doesn’t explain why the water…

DENSITY – Will a can of coke float? Experiment

The density of water will vary slightly depending on its temperature. So how do we make the coke float? With the can of Coke still submerged in the water. Since the density of the unopened can of Coke is fixed, the only thing we can change is the liquid in which to float the Coke. This liquid would need to have a specific gravity greater than the specific gravity of the can of Coke. What liquid can we use? So I will start adding containers of salt. Each container of salt is 26 oz 737g. It ended up taking 1…

VISCOSITY RACES investigating the flow of liquids experiment

WHAT YOU NEED ketchup , mustard, molasses, corn syrup, and spaghetti sauce, honey, bbq or any other liquids.   PROCEDURE Spread out a sheet or two of newspaper to make cleanup easier.   Put a small amount of ketchup and other liquids on the plate, being careful to keep them apart. If they end up touching it will not work. You are setting up the start line of a race between the different liquids.   Before you do the next step make a prediction on which liquid is going to win the race?   Now once you have all the…

How can you pour water down a string?

Water has some special properties, making it a very unique substance.   There are three forces at work in this experiment: gravity, adhesion, and cohesion. Gravity pulls the water down toward Earth. Adhesion attracts water to other objects. Cohesion attracts water molecules to other water molecules. In this experiment adhesion attracts the water to the string and cohesion keeps the water flowing in a steady stream.   Water molecule has two hydrogen atoms and one oxygen atom. These atoms end up having positive and negative charges, which cause them to stick to one another. This is why you see raindrops…

Gallium experiment

Gallium is a chemical element with symbol Ga and atomic number 31. It is in group 13 of the periodic table. It will melt to a liquid at temperatures greater then 85 degree, slightly above room temperature. Which means it will melt in your hands.   Health effects of gallium Pure gallium is not a harmful substance for humans to touch. It has been handled many times only for the simple pleasure of watching it melt by the heat emitted from a human hand. However, it is known to leave a stain on hands.  

Energy Tube Experiment

The way the Energy Tube’s works is a sensing circuit that is so sensitive that it can detect even a very small amount of electricity that travels across your skin! By placing one hand on the top and the other on the bottom of the Energy Tube and the flashing lights and sound maker let you know that you’ve completed the circuit.  

Making Butter experiment

Heavy cream is what is called an “emulsion”. An emulsion exists when tiny droplets of one type of liquid are floating around in another type of liquid that does not like to mix with the first. In the case of heavy cream, tiny globules of fat are suspended in mostly water. By shaking the heavy cream in the cup (5 minutes), you are forcing the fat globules to slam into one another. If they hit each other with enough force, they will simply stick together, the fat collection becoming bigger and bigger with each extra globule. After enough shaking, the…

Scribble Bots Experiment

Scribble Bots are loads of fun to make and provide lots of creative thinking opportunities. This simple version uses a small motor and pens fixed around a cup. The motor makes the arm Popsicle stick spin, which in turn makes the scribble bot move.   Give kids the challenge, such as getting the Scribble-Bot to draw a dotted line or left to explore freely going through an iterative process of designing, testing and amending their ideas. Try different propellers such as a cork, clay or straws and mix with different objects like smaller cups and cans or even a small…

Making Ice cream in a Bag experiment

1/2 cup Heavy Whipping Cream 1/2 teaspoon vanilla (Optional) 1 tablespoon sugar 4 cups crushed ice 1/2 cup Ice Cream salt (Rock Salt) 2 quart size Zip-loc bags 1 gallon size Zip-loc freezer bag   When salt and ice mix, the freezing point of the ice is lowered and the freezing point reached depends on the amount of salt used. The more salt is added, the lower the temperature can get before the saltwater solution freezes. Remember the more salt add the colder your hands will get.  

Mysterious Glowing Light

When the ball is stationary, you will observe a white light, but when the ball is in motion (in a darkened room), you will see alternating red, blue, and green lights.   Inside the ball are three colored LEDs that rapidly cycle between red, blue and green light. When the ball is stationary, the eye focuses all three colors on the same part of the retina. As a result, our brain interprets this as white light. This is due to the persistence of vision that occurs inside the brain.   The brain remembers each of the different colored lights for…

Poly Density Experiment

The Poly Density Kit comes with bottle, white and blue beads and salt. You just need to add rubbing alcohol (70% or 91%). Both work but require different steps to setup.   In the bottle we have a mixture of rubbing alcohol, pure salt, water and white & blue beads.   When the bottle is shaken, the two liquid layers momentarily mix, forming a homogeneous mixture.   Water and rubbing alcohol are soluble in all proportions. Both the water molecules and the alcohol molecules easily hydrogen bonds to each other. The sodium chloride salt particles, however, bind with the water…

Memory Wire Experiment

Memory Wire. This wire is amazingly cool – a wire that, no matter how you shape it, when heated will instantly spring back to straight. It’s called Nitinol Wire, which is alloy of 50% Nickel and 50% Titanium also called memory wire.   This metal changes phase around 50oC. Bend it, then drop it into hot water and watch it return to its original shape! Can be set into different shapes by heating with a candle flame.  

Walk Through Paper Trick

Ask someone if they can cut out a regular size piece of paper so they can put their body through it? The paper has to be in one piece and can not use anything to hold it together. Then tell them you can do this after they can not do it.   Go to the link below for the print out of the Walk Through Paper. Cut out on the lines. Make sure only to cut the 6 pieces on the folded part in the middle, Do NOT cut the ends. Then unfold and you will be able to walk…

Spun Eggs Experiment

This is a great hands on experiment for kids, specially with easter right around the corner. See if your friends can tell the difference between a raw and hard boiled egg without breaking them?   The hard-boiled egg spins smoothly and quickly. It will even stand up straight, this is because the egg inside is solid. The raw egg wobbles as it spins because the egg inside is liquid. As the raw egg is spinning, the liquid inside sloshes around, and affects the egg’s spin. Why does this affect the egg’s spin? It’s because of Newton’s First Law of Motion….

Stand up egg Experiment

Try standing an egg upright on a table, balancing the small end on its end – it’s not easy is it? And No you can’t crush it on one end of the egg. That is cheating.   The secret material we used is salt. If you sprinkle a little table salt where you are going to place the egg…. Hey presto! The egg stands up on its own.   The Salt crystals are very angular and cube like, so they don’t role out of the way. This makes them a good base for the egg to balance on! After the…

Orange Peel Pop a Balloon Experiment

The juice from an orange peel causes a balloon to pop. When I first saw this I thought to myself, “ what is the Science behind this experiment?” What I found out is, the compound in orange peels called limonene, which is responsible for this pop. It’s just Awesome to do this experiment! Every time I did this experiment I knew the balloon was going to pop and I jumped. FUN haha   Limonene is a hydrocarbon. Latex rubber is also a hydrocarbon. Hydrocarbons will dissolve together if in contact with each other. So when the citrus oil touches the…

Quick Crystals with Epsom Salt Experiment

Epsom salt is another name for the chemical magnesium sulfate.   How do the Epsom salts crystals grow? Hot water holds more Epsom salts crystals than cold water does. That’s because heated water molecules move farther apart, making room for more of the Epsom salts crystals to dissolve. When no more of the crystals can be dissolved, you have a saturated solution. As this solution cools, the water molecules move closer together again.   Cooling the solution rapidly (in Freezer 10 minutes) encourages fast crystal growth, since there is less room for the dissolved salt in the cooler, denser solution….

Cloud in a Jar Experiment

Clouds are formed when water droplets in the air cool and then collect on dust particles. In this experiment, the smoke provided the dust particles from the match.   You will see vapors form inside the jar this is because the warm water and the match heated the air. The warm air rose to the top of the jar and touched the cool air from the ice cubes. When the warm wet air meets with the cold air it forms a cloud of water droplets. This is what you see with our clouds outside. Clouds are filled with water droplets…

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