{"product_id":"driftgale-the-thermal-drift-wind-spirit-mug","title":"Driftgale, the Thermal-Drift Wind Spirit Mug","description":"\u003cp\u003eAluminium's thermal expansion coefficient is about 23 × 10⁻⁶ K⁻¹, so a 1 m aluminium path grows 23 µm per kelvin, about 36 HeNe wavelengths.\u003c\/p\u003e\n\u003cp\u003eThe joke: Interferometrists know the AC cycling at night shifts fringes by dozens of wavelengths. The slogan on the mug reads \u003cstrong\u003eONE KELVIN. 23 MICRONS. NO FRINGES.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSource: CRC Handbook of Chemistry and Physics, 'Thermal expansion of metals' (α\u003csub\u003eAl\u003c\/sub\u003e ≈ 23.1 × 10⁻⁶ K⁻¹).\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50976159662183,"sku":"32515382629909273480","price":21.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/9795688802256000278_2048.jpg?v=1793683601","url":"https:\/\/pixelatedphysics.com\/hi\/products\/driftgale-the-thermal-drift-wind-spirit-mug","provider":"Pixelated Physics","version":"1.0","type":"link"}