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| butter churn ： ウィキペディア英語版 |
butter churn
A butter churn is a device used to convert cream into butter. This is done through a mechanical process, frequently via a pole inserted through the lid of the churn, or via a crank used to turn a rotating device inside the churn.
==Process==
The agitation of the cream, caused by the mechanical motion of the device, disrupts the milk fat. The membranes that surround the fats are broken down, subsequently forming clumps known as butter grains. These butter grains, during the process of churning, fuse with each other and form larger fat globules. Air bubbles are introduced into these fat globules via the continued mechanical action of the churn. The butter grains become more dense as fat globules attach to them while the air is forced out of the mixture. This process creates a liquid known as buttermilk. With constant churning, the fat globules eventually form solid butter and separate from the buttermilk. The buttermilk is then drained off and the butter is squeezed to eliminate excess liquid and to form it into a solid mass.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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