{"product_id":"magnetonix-bohr-magneton","title":"Magnetonix – Bohr Magneton \/ The Unit of Atomic Magnetism Physics Sticker","description":"\u003cp\u003eMagnetonix, a compass-needle imp of The SI Guard, is ringed by his own electron loop and is a magnet of about one Bohr magneton.\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eAn electron with one unit of orbital angular momentum ħ has a magnetic moment of one Bohr magneton. This is the natural unit for atomic and electron magnetism.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eμ\u003csub\u003eB\u003c\/sub\u003e = eħ\/(2m\u003csub\u003ee\u003c\/sub\u003e) = 9.274 010 0657(29) × 10⁻²⁴ J\/T\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eμ\u003csub\u003eB\u003c\/sub\u003e: Bohr magneton (J\/T)\u003c\/li\u003e\n\u003cli\u003ee: elementary charge (exact)\u003c\/li\u003e\n\u003cli\u003eħ: reduced Planck constant (exact)\u003c\/li\u003e\n\u003cli\u003em\u003csub\u003ee\u003c\/sub\u003e: electron mass (measured)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eValue: CODATA 2022 (NIST). μ\u003csub\u003eB\u003c\/sub\u003e is not exact in the 2019 SI because m\u003csub\u003ee\u003c\/sub\u003e is measured. Because the electron is negative, its moment points opposite to its angular momentum. The electron's spin moment is about 1.001 16 μ\u003csub\u003eB\u003c\/sub\u003e (|g\u003csub\u003ee\u003c\/sub\u003e|\/2), and the extra 0.1% comes from quantum electrodynamics.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eHonest caveat:\u003c\/em\u003e Spin is intrinsic. The electron is not a tiny spinning ball of charge: a classical sphere would need a surface speed faster than light to give this moment.\u003c\/p\u003e\u003ch3\u003eOn the sticker\u003c\/h3\u003e\u003cp\u003eMagnetonix stands inside his glowing electron orbit, under a magnetic-field-line aurora. Printed text: \u003cstrong\u003eMAGNETONIX\u003c\/strong\u003e with the line \u003cstrong\u003eμB = eħ\/(2me)\u003c\/strong\u003e. Pixel-art kiss-cut vinyl sticker, white, in 2″, 3″, 4″ and 6″ sizes.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"2\" × 2\" \/ White","offer_id":50963654901863,"sku":"21118408629413649741","price":4.99,"currency_code":"USD","in_stock":true},{"title":"3\" × 3\" \/ White","offer_id":50963654934631,"sku":"23143967932990764897","price":6.99,"currency_code":"USD","in_stock":true},{"title":"4\" × 4\" \/ White","offer_id":50963654967399,"sku":"25461725424720410735","price":8.99,"currency_code":"USD","in_stock":true},{"title":"6\" × 6\" \/ White","offer_id":50963655000167,"sku":"31374304834901121277","price":11.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/16212680373495645801_1200.jpg?v=1793665040","url":"https:\/\/pixelatedphysics.com\/it\/products\/magnetonix-bohr-magneton","provider":"Pixelated Physics","version":"1.0","type":"link"}