You've seen this picture in our catalog and on the web... now here is your chance to reproduce it! Our Ferrofluid* Bolt Kit comes complete with everything you need to create the amazing field spikes seen here. Each kit includes a 50 ml bottle of Ferrofluid, a special ferrous nut and bolt, and magnets. Makes a great demonstration. Can be used again and again.
*A ferrofluid is a liquid that becomes strongly magnetized in the presence of a magnetic field.
While Ferrofluid is amazing, it is also very messy stuff. Rubber gloves, safety goggles, and protective clothing should be used. Close adult supervision required.
The Ferrofluid in the display cells is not the same as the Ferrofluid in the Bolt Kit. This Ferrofluid cannot be used to make a display cell.
Our Ferrofluids are intended for educational and demonstration purposes only. They are not designed for use in loudspeakers or any other device. Sorry, we do not carry any Ferrofluids designed for such purposes.
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Download the SDS of this product.
Download the pdf of this lesson!
Download the SDS of this product.
When a black liquid is slowly dropped on the top of a magnetized bolt, numerous spikes form.
- Neodymium magnets are extremely strong and unexpectedly can attract other magnets or
pieces of ferrous metal. Often this results in pinched fingers and flying chips from the
- Safety glasses, rubber gloves, and protective clothing must be worn whenever using neodymium magnets and ferrofluid. When neodymium magnets collide with an object, they sometimes chip and ferrofluid will permanently stain surfaces such as tabletops, clothing, skin, or eyes.
- Do not bring a magnet close to the liquid ferrofluid, as it will cause the ferrofluid to jump to the magnet.
- Carefully, attach the large washer to one of the flat surfaces of the two neodymium magnets. This gives the base stability.
- Set the plastic dish on the top surface of the magnets and secure with the nut and bolt assembly.
- Slowly drip the ferrofluid, a drop at a time, onto the TOP of the assembly, keeping the pipet well away from the magnets at all times. Numerous spikes should form. WARNING: if you add the ferrofluid too quickly, it may make a mess.
When finished, use the pipet to draw up the ferrofluid and return it to its bottle.
Things to Try:
Bring a magnet to within 12 inches of the ferrofluid on the bolt and observe the effect on the spikes. What happens when you move this magnet? What is the greatest distance a magnet can affect the spikes? Repeat with another magnet. Using the two distances and the Inverse Square Law, determine the relative strengths of the two magnets.
Write a review
Feb 1, 2017 | By TRACI COOPER of ANTIOCH, TN United States
Oct 16, 2014 | By Paula of Muskegon, MI United States
Owner Response:Yes, we agree, this is really more of a demonstrative material, especially for younger kids.
Overall a good product
Nov 15, 2013 | By Michael of Lake View , NY United States
Ferrofluid kit worth the money
Feb 6, 2013 | By Angela Miller of Columbus, OH United States
May 29, 2012 | By Tsai Cheng ming of Taiwan
May 29, 2012 | By William Swanson of El Paso, TX United States
This product will support your students' understanding of the Next Generation Science Standards (NGSS)*, as shown in the table below.
Suggested Science Idea(s)
Students will benefit from demonstrations using Ferrofluid. Ferrofluid can be quite messy if handled recklessly. This kit is recommended for hands-on use with students in middle school and older.
Students can use Ferrofluid to gather and make sense of information during an investigation.
Students can use the Ferrofluid in an investigation to ask questions about data to determine the factors that affect the strength of magnetic forces.
Students can use the Ferrofluid to conduct an investigation and evaluate the experimental design to provide evidence that fields exist between objects exerting forces on each other even though the objects are not in contact.
Students can do an activity with the Ferrofluid with a Bar Magnet to construct an explanation based on evidence for how geoscience's processes have changed Earth's surface at varying time and spatial scales.
The Ferrofluid can be used to develop and model how two objects interacting through magnetic fields, illustrates the forces between objects and the changes in energy of the objects due to the interaction.
Using a variety of magnet shapes and the Ferrofluid will allow students to observe the various shapes magnetic field can take.
When a bar magnet is used, it can model how the magnetic properties of the North and South Poles of the Earth. Students can use this information to model how, over the course of Earth's history, the magnetic field of the poles have swapped location, based on magnetic readings of the Atlantic Ocean floor. Rotate the magnet 180 degrees to model the geologic history of the Earth's magnetic field.
Each pure substance has characteristic physical and chemical properties that can be used to identify it.
Investigations using Ferrofluid and magnets will demonstrate the attraction and repulsion between electric charges at the atomic scale explain the structure, properties, and transformations of matter, as well as the contact forces between material objects. Use the Ferromagnetic Liquid to show the magnetic field.
Students can use the Ferrofluid to develop a model to describe a phenomenon. The students will be engaged in learning as they visualize various magnetic fields.
* NGSS is a registered trademark of Achieve. Neither Achieve nor the lead states and partners that developed the Next Generation Science Standards were involved in the production of, and do not endorse, this product.