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'<div>
作者:yi zhang<br />
鏈接:http://www.zhihu.com/question/20360485/answer/34507011<br />
來源:知乎<br />
著作權歸作者所有。商業轉載請聯繫作者獲得授權,非商業轉載請註明出處。<br />
<br />
<div class="zm-editable-content clearfix">
首先,浮在咖啡表面的那層拉花到底是什麼?<br />
<br />
可能大家都不會太多考慮這個問題。<br />
<br />
但在科學家眼裏就是兩種微泡沫(microfoam)的混合物,顏色不同,但是可以你進入我我進入你,所以纔可以創造圖案。<br />
所以要得到這樣的花,必須使得兩種泡沫混合在一起。<br />
<br />
首先,我們得有這兩種泡沫,其次這兩種泡沫得在正確的時間正確的地點相遇。<br />
<br />
那麼第一種,我們得有來自咖啡的泡沫,crema<br />
<noscript>&lt;img src="https://pic4.zhimg.com/48d29bcbc2f3a69a0de1b3f2e816952f_b.jpg" data-rawwidth="526" data-rawheight="558" class="origin_image zh-lightbox-thumb" width="526" data-original="https://pic4.zhimg.com/48d29bcbc2f3a69a0de1b3f2e816952f_r.jpg"&gt;</noscript><img class="origin_image zh-lightbox-thumb lazy" data-actualsrc="https://pic4.zhimg.com/48d29bcbc2f3a69a0de1b3f2e816952f_b.jpg" data-original="https://pic4.zhimg.com/48d29bcbc2f3a69a0de1b3f2e816952f_r.jpg" data-rawheight="558" data-rawwidth="526" src="https://pic4.zhimg.com/48d29bcbc2f3a69a0de1b3f2e816952f_b.jpg" style="width: 526px; height: 558px; display: block;" width="526" /><br />
上圖就是一張咖啡脂的照片,下面黑色部分是咖啡,上面褐色泛紅部分是咖啡脂,是用接近沸騰的熱水以高壓衝過細細研磨後壓實的咖啡粉得來,之所以是這個顏色,是因爲咖啡脂肪,其他顆粒和空氣混合體系對空氣折射的緣故。<br />
<br />
中國人一般不太喝意式咖啡,覺得太苦,事實上品嚐意式咖啡,這上面一層咖啡脂肪才重要,風味分子大多是脂溶性,所以咖啡脂是意式咖啡風味的靈魂,也是評判一杯意式咖啡和咖啡師水平好壞的關鍵。<br />
<noscript>&lt;img src="https://pic3.zhimg.com/99a74768e608564cb5319cd83724cdea_b.jpg" data-rawwidth="493" data-rawheight="404" class="origin_image zh-lightbox-thumb" width="493" data-original="https://pic3.zhimg.com/99a74768e608564cb5319cd83724cdea_r.jpg"&gt;</noscript><img class="origin_image zh-lightbox-thumb lazy" data-actualsrc="https://pic3.zhimg.com/99a74768e608564cb5319cd83724cdea_b.jpg" data-original="https://pic3.zhimg.com/99a74768e608564cb5319cd83724cdea_r.jpg" data-rawheight="404" data-rawwidth="493" src="https://pic3.zhimg.com/99a74768e608564cb5319cd83724cdea_b.jpg" style="width: 493px; height: 404px; display: block;" width="493" /><br />
上圖爲咖啡脂泡沫的微觀結構圖,引用自Ernesto Illy& Luciano Navarini<br />
<br />
咖啡脂的存在往往被視爲濃縮咖啡質量的標誌,其體積要佔到濃縮咖啡的 10% 以上。咖啡脂裏面含有許多氣體,大概在總體積的一半左右。<br />
如下圖,在光學顯微鏡下觀察咖啡脂的結構,可以看出裏面含有氣泡、脂肪顆粒(一般小於 10 個微米)以及一些固體的顆粒(咖啡豆細胞壁的碎片之類) 。引用自沐右[咖啡拉花:泡沫圓舞曲 ]<br />
<br />
咖啡脂泡沫的多少除了與咖啡豆本身有關,還與packing這個技術相關,就是把咖啡粉放進小容器中再壓一下的那個動作,壓得越緊實越容易萃取出咖啡脂但是若是太緊咖啡可能流不出來,所以非常有技巧。</div>
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'mid' => 'article',
'pcatpost' => 1,
'topid' => '4',
'domain' => '',
'catids' =>
array (
0 => '308',
),
'is_post' => 1,
'mobile_domain' => '',
'tid' => 1,
'url' => 'https://gafei.com/list-lahua.html',
'total' => 158,
'field' =>
array (
),
),
) |
urlrule |
'/views-53091-[page].html' |
fix_html_now_url |
'' |
my_web_url |
'https://test.gafei.com/views-53091' |
get |
array (
's' => 'article',
'c' => 'show',
'id' => '53091',
'm' => 'index',
) |