How Does 'Kinetic' Sand Work? (2024)

How Does 'Kinetic' Sand Work? (1)

A mesmerizing material called "kinetic sand," which can be molded like clay but also somehow feels silky, is enjoyable for kids and adults alike.

A search on Instagram for #kineticsand, for example, turns up thousands of videos of people slicing, smashing and scooping the stuff, in what looks like a grand sensory experience.

But what gives kinetic sand its transfixing effects? [Science Experiments for Kids]

Kinetic sand is regular sand that's been coated with silicone oil, said Rick Sachleben, a member of the American Chemical Society.

"Silicone" doesn't refer to one specific material but rather a group of materials that contain the elements silicon and oxygen. Silicones are polymers, meaning they're molecules made up of long chains of repeated units.

The compounds are used in "all sorts of products, from cosmetics, lotions, shampoos and conditioners, to lubricants and sealants," Sachleben said.

"Silicone oils have unique properties in that they can be liquids that flow freely, or semisolids that flow slowly in the absence of pressure, but act like rubbery solids under stress," Sachleben told Live Science. This characteristic is called "viscoelasticity," he said.

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But a substance's degree of viscoelasticity depends on the length of the polymer chains in the silicone oil, Sachleben said.

For example, "Imagine long (very long!) strings of spaghetti," Sachleben wrote in an email. "They stick together, so [they] can hold a shape, but place a ball of them on the counter and, over time, they slowly sink down into a low pile. Longer strings [of spaghetti] hold their shape better than shorter ones."

Similarly, with kinetic sand, the polymer chains within the silicone oil make the sand particles stick together so you can form them into a ball. However, the ball will slowly flatten out over time.

But the silicone-oil-coated sand particles stick only to each other, not to other surfaces, Sachleben noted. This is why kinetic sand doesn't seem "sticky" and is easy to clean up, he said.

Originally published on Live Science.

How Does 'Kinetic' Sand Work? (2)

Staff Writer

Sara is a staff writer for Live Science, covering health. She grew up outside of Philadelphia and studied biology at Hamilton College in upstate New York. When she's not writing, she can be found at the library, checking out a big stack of books.

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How Does 'Kinetic' Sand Work? (2024)

FAQs

How Does 'Kinetic' Sand Work? ›

Kinetic means “togetherness due to movement and energy” and is used to describe Kinetic Sand because, unlike the sand at the beach, Kinetic Sand sticks together when force is applied to it. When a liquid is added to cornstarch it starts to become thicker, similar to how sand becomes heavier with water at the beach.

What is the secret to Kinetic Sand? ›

To make this kinetic sand recipe, just remember the ratio 5:3:1. That way, whether you have a measuring cup, or just a little container or scoop, you can get the ratio right. It's 5 parts sand, to 3 parts cornstarch (you can also sub flour for the cornstarch), and 1 part oil.

What makes Kinetic Sand stick to itself? ›

We think this odd behavior happens because the polymer coating makes the sand stick to itself. So as a grain of sand moves—even a little—it pulls other grains along with it.

What is in Kinetic Sand that makes it stick together? ›

Similarly, with kinetic sand, the polymer chains within the silicone oil make the sand particles stick together so you can form them into a ball. However, the ball will slowly flatten out over time. But the silicone-oil-coated sand particles stick only to each other, not to other surfaces, Sachleben noted.

What is the chemistry behind Kinetic Sand? ›

Kinetic Sand looks like regular wet sand but is available in different colors. It can be molded into any desired shape. It is 98% ultra-fine grain sand mixed with 2% dimethicone (polydimethylsiloxane), and coated with olive oil. Because of its oil coating, the sand never dries out.

What happens if Kinetic Sand gets wet? ›

Kinetic Sand™ will return to its normal texture at 60% humidity. If Kinetic Sand™ gets wet, air dry it until it returns to its normal texture. If Kinetic Sand™ is too dry, add a few drops of water using an eyedropper and mix thoroughly.

What keeps Kinetic Sand from drying out? ›

Kinetic Sand does not dry out; it's probably just the humidity affecting it. Simply add a couple of drops of water with an eyedropper and it will return to its original state.

Is Kinetic Sand sanitary? ›

It is comprised of sand coated with silicone oil, holding its shape when squeezed or pressed. It is described as a non-toxic, hypoallergenic, safe sand for arts and crafts and is highly appealing due to its realistic appearance and odor.

What is the difference between Kinetic Sand and moon sand? ›

Moon sand hates water, and won't let it touch it. Kinetic sand is coated with something that makes it stick to itself for a little while then fall apart. it doesn't like to clump, and won't hold a shape. its mesmerizing to watch it fall apart, and it won't stick to other things either.

Why does my Kinetic Sand smell bad? ›

When sand starts to smell badly, throw it out and make new batch. You may have to adjust the moisture of the Kinetic sand. If it is too dry, add a little more water. If it is too damp, allow it to air dry a bit.

How long does kinetic sand last? ›

If well-kept, kinetic sand should last for years. It doesn't dry out or go bad. You can extend its shelf life by storing it properly.

Can I make kinetic sand at home? ›

You can transform regular play sand into kinetic sand by adding a couple of easy-to-find ingredients – mainly cornflour (aka corn starch if you're in the States) and an agent to add the extra firmness – we've used vegetable oil here but you can also use a mix of water and washing up liquid.

Why is kinetic sand so slippery? ›

I dont have carpeted floors so while that makes it easy to play with the sand anywhere, one needs to be cautious when walking on the affected areas. Kinetic sand contains oil so it does make the floor slippery.

What is the secret ingredient in kinetic sand? ›

Store-bought Kinetic Sand is made from fine sand and polydimethylsiloxane (also called dimethicone). It's an unusual substance in that its viscosity increases under stress. You can form it into fun shapes and slice it. However, it's not the cheapest thing to buy.

What is the difference between kinetic sand and magic sand? ›

Magic Sand a hydrophobic polymer, so this sand will never get wet. Kinetic sand can be shaped into underwater sand castles. Explore the differences between Magic Sand and regular sand with our kinetic sand activities.

What was kinetic sand invented for? ›

Magic sand was originally developed to clean up oil spills. The idea was that the coating would repel water but help attract and trap oil.

What is kinetic sand that doesn't get wet? ›

Magic Sand is a hydrophobic polymer that never gets wet! Build underwater sand castles! Explore the differences between Magic Sand with regular sand!

How to make kinetic sand stretchy? ›

The secret ingredient that makes your DIY kenetic sand stretch is the soap. It gives your playdough sand a stretchy like substance. Once you've made the kinetic sand If you feel it's not stretchy enough you can add a little bit more soap.

How do you make kinetic sand more fun? ›

We only recommend items our team loves!
  1. Hunt for buried treasure. ...
  2. Build a kinetic sand potato head. ...
  3. Go on an alphabet hunt. ...
  4. Chicka chicka sand sand! ...
  5. Cook up (pretend) healthy meals. ...
  6. Practice writing letters and numbers. ...
  7. Find Pete the Cat's groovy buttons. ...
  8. Use kinetic sand with 10 frames.
Oct 23, 2019

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