Oil and Water
To understand the emulsifying process, we must first accept the scientific principle that oil and water do not naturally mix. Quite literally, they find each others presence repulsive. A good illustration of this aversion is homemade oil and vinegar salad dressing.When you shake or beat your salad dressing, you do more than disperse the oil throughout the vinegar: you also break down the oil into droplets minute enough to remain temporarily suspended in the vinegar . The second you stop agitating the dressing, the oil droplets start to combine into units too large to be suspended in the water, and thus slither their way upward, separating from the water in the process. The oil rises to the top and the water sinks because oil has a lower specific density than water. If you want a stable emulsion, you need an emulsifying agent which prevents the oil droplets from combining into larger units. Emulsifying agents occur naturally in many animal substances including egg yolks and milk. An emulsifying agent helps to keep the oil particles from combining in three basic ways. First, the agent coats the oil, serving as a physical barrier between the droplets. Second, it reduces the waters surface tension, which, in turn, reduces the waters ability to repulse oil. Third, the agent gives the surfaces of the oil droplets identical electrical charges; since like charges repel each other the droplets repel each other.
上一篇: 英语六级写作分类范文其他范文3
下一篇: 英语六级写作分类范文表画型6
商品价格以 .99结尾,让你觉得价格更低
多方联动!严防新型冠状病毒感染的肺炎疫情蔓延
国际英语资讯:Palestinians join mass protests in West Bank, Gaza against Trumps Mideast peace plan
国内英语资讯:Patient treatment, supplies highlighted in Chinas epidemic control meeting
鼠年到!盘点最受喜爱的中外老鼠明星
国际英语资讯:Bolivias MAS presidential candidate returns to Bolivia for campaign
体坛英语资讯:PSG cruise into French League Cup quarterfinals
国内英语资讯:MIIT, Red Cross Society to ensure supplies for pneumonia prevention
国际英语资讯:U.S. Fed expected to leave rates unchanged in first meeting of 2020
国际英语资讯:Spotlight: In blow to U.S., EU enables Huaweis participation in 5G
国内英语资讯:China extends holidays, strengthens control of coronavirus epidemic
体坛英语资讯:Diamond League has to change, says World Athletics president Coe
体坛英语资讯:Basketball Africa League unveils official logo
研究显示:和婴儿玩耍时,你们的脑电波会同步
体坛英语资讯:Kenyan handball seeks to seal maiden ticket for Olympics
国际英语资讯:Trump unveils controversial Middle East peace plan
国内英语资讯:Chinas agricultural policy bank supports protective equipment production
国际英语资讯:UN appreciates Chinas effort against novel coronavirus: Guterres
国内英语资讯:Xi orders military to contribute to winning battle against epidemic
国内英语资讯:China fully confident in winning battle against novel coronavirus: Xi
国际英语资讯:Trump signs new trade deal with Canada, Mexico into law
体坛英语资讯:Africa countries moot to start six-nation professional hockey league
这些过年传统美食 让你越吃越好运
体坛英语资讯:Diego Forlan to coach Uruguays Penarol
国内英语资讯:100 more traditional Chinese medicine workers dispatched to Wuhan
体坛英语资讯:Wu Leis brace lifts Espanyol to Copa del Rey second round
体坛英语资讯:Bayern beat resilient Freiburg 3-1 in Bundesliga
体坛英语资讯:Petra Vlhova wins Slovakias 2019 Sportsperson of the Year award
The Lazy Me 懒惰的我
国际英语资讯:5.4-magnitude quake strikes Japans Hokkaido Prefecture