{"product_id":"ferrofluid-magnetic-display-physics-of-field-lines-in-a-vial","title":"Ferrofluid Magnetic Display — Physics of Field Lines in a Vial","description":"\u003cp\u003e\u003cstrong\u003eMaxwell's equations made visible — on your desk.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe ferrofluid responds to magnetic field lines, forming spike structures (Rosensweig instability) when a neodymium magnet is brought close. The spikes align with the local field gradient — the geometry you see is a direct physical map of the magnetic field topology. Iron nanoparticles suspended in oil, each coated to prevent agglomeration; the carrier fluid magnetizes as a bulk material. The spike height and spacing are determined by a competition between magnetic energy, surface tension, and gravity — a solvable problem in continuum mechanics.\u003c\/p\u003e\u003cp\u003eBring a magnet near the vial and watch the topology change in real time. Rotate the magnet and the spikes rearrange. Each configuration is a different solution to the same field equation.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e10ml ferrofluid in sealed borosilicate vial\u003c\/li\u003e\n\u003cli\u003e3 neodymium disc magnets\u003c\/li\u003e\n\u003cli\u003eAcrylic display stand\u003c\/li\u003e\n\u003cli\u003e6 demonstration instructions\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eShips within 7–14 business days.\u003c\/em\u003e\u003c\/p\u003e","brand":"Golden Physics Project","offers":[{"title":"Default Title","offer_id":54060403818788,"sku":"GPP-FERRO-VIAL","price":34.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2879\/9524\/files\/P8-4000FerrofluidDisplayCell2048x2048.jpg?v=1780680390","url":"https:\/\/shop.goldenphysics.org\/products\/ferrofluid-magnetic-display-physics-of-field-lines-in-a-vial","provider":"Golden Physics Project","version":"1.0","type":"link"}