{"product_id":"giant-soap-bubble-kit-surface-tension-physics-lab","title":"Giant Soap Bubble Kit — Surface Tension Physics Lab","description":"\u003cp\u003e\u003cstrong\u003eMake bubbles the size of a person. The physics of minimum surface area made visible at human scale.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA soap bubble is a physical solution to a calculus problem: what shape encloses a given volume with minimum surface area? The answer is a sphere — and soap films find this solution automatically through surface tension. The iridescent colours are thin-film interference: light reflecting from the inner and outer soap surfaces, with path-length differences that cause constructive or destructive interference at specific wavelengths. The colours you see encode the thickness of the film — nanometre-scale measurements visible to the naked eye.\u003c\/p\u003e\u003cp\u003eThis kit's formula (glycerol + surfactant ratio) allows bubbles that last for minutes and grow large enough to step inside.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e Giant bubble wand (1m cord) · Concentrated formula (makes 5L) · Small geometric bubble frame set · Guide with thin-film optics explanation\u003c\/p\u003e\u003cp\u003eAges 5+. Best outdoors. Ships within 7–14 business days.\u003c\/p\u003e","brand":"Golden Physics Project","offers":[{"title":"Default Title","offer_id":54805634875684,"sku":"GPP-BUBBLE-KIT","price":19.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2879\/9524\/files\/960px-Reflection_in_a_soap_bubble_edit.jpg?v=1781381724","url":"https:\/\/shop.goldenphysics.org\/products\/giant-soap-bubble-kit-surface-tension-physics-lab","provider":"Golden Physics Project","version":"1.0","type":"link"}