EP.255 用物理學沖出完美咖啡?窮物理人教你怎麼用少量豆沖出極濃香! 咖啡是物理學家的必備能源,但最近因為氣候異常,咖啡豆價格暴漲,窮哈哈的物理學家們被迫思考:「能不能用更少咖啡粉,泡出一樣濃的咖啡呢?」 他們從手沖咖啡著手,想看看「倒熱水的高度」與「熱水流速」會怎麼影響咖啡萃取。 因為咖啡粉太黑看不清楚,只好先用透明矽膠顆粒取代咖啡粉,再用層光雷射和高速攝影機觀察,再用真正的咖啡粉驗證。 結果發現,水柱夠高時衝擊力強,會產生「雪崩效應」,引起「咖啡粉土石流」,讓咖啡和水充分混合,提升萃取效果。 放慢流速增加萃取時間,可以更上層樓。 但是過猶不及,水柱如果太高太細,會斷成小水滴,動能減弱,效果就變差了。 最佳技巧是:稍微拉高倒水高度,放慢水流,但是流速必須足以維持穩定的水柱。 只要抓住這個秘訣,少少咖啡豆也能泡出超級香濃的咖啡了! 賓州大學新聞稿(2025/04/10):https://penntoday.upenn.edu/……/penn-sas-physics…… Physics of Fluids論文(2025/04/08):https://pubs.aip.org/……/Pour-over-coffee-Mixing-by…… #咖啡 #手沖咖啡 #矽膠顆粒 #雷射 #高速攝影機 -- Hosting provided by SoundOn
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