Ferrofluid: Overview and Experiment
NASA first developed ferrofluid while experimenting with different methods to control liquid in zero-gravity space conditions. Since it was developed, ferrofluid is now used in a number of practical applications like:
- Improving the sound quality in speakers.
- Protecting computer disk drives.
- Sealing substance common for industrial use.
Ferrofluid holds unique properties because it imitates both a liquid and a solid with its magnetism. Its magnetism comes from the metal particles like iron or cobalt and shows the lines of the magnetic fields when manipulated with a magnet. Ferrofluid’s uniqueness makes it a great inspiration for informative and cool science experiments. Below is a simple experiment to use to explore the properties of magnetism and magnetic fields.
Supplies
- Ferrofluid Kit
- Penny
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Wear disposable gloves and other protective gear- ferrofluid can be messy and will stain clothing, skin, and work areas.
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Keep it out of open air-it will evaporate when exposed.
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Use only with adult supervision.
Instructions
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After applying all safety gear, put down your petri dish from the kit on a flat work surface.
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Pour in a small amount of ferrofluid, just enough to cover the bottom of the dish.
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Next lift the petri dish and hold the strong magnet from your kit underneath.
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Spikes will form. These spikes are representative of earth’s magnetic fields.
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To further experiment, remove the magnet again and set a penny into the dish.
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The penny will sink, but when you hold the magnet underneath the dish the penny will be pushed up.
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What pushed the penny up?
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How is ferrofluid both a liquid and a solid?