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BOIL OVER PREVENTER BACK TO COOKING GADGETS  
     

Milk Watcher, Milk Saver, Pot Watcher, Pot Minder, Milk Guard, or Boil Over Preventer is a cooking utensil placed at the bottom of a pot to prevent boiling over of liquids, and especially the burning(scorching) of Scalded milk..

A milk watcher is a disk with a raised rim, and is notched on one side (see images). Some milk savers are designed so they can be used with the obverse or reverse side facing up, so they appear to have two notches. While difficult to see in the pictures the interior of the disk is not level, it slants upward toward the notched

Porcelain Milk Watcher - Notice that there is one notch on each side, and how the interior slants toward the notch Porcelain Milk Watcher - Notice that there is one notch on each side, and how the interior slants toward the notch  

side creating a space just behind the notch where water vapor can collect. Water vapor is trapped under the Milk Saver causing the notched side to rise up, releasing the water vapor at the same time circulating liquid around the base of the pot and making a rattling noise.

How It Prevents Boil Over

  
Normally boiling water does not boil over. When fats, starches, and perhaps other substances are present in boiling water, for example by adding milk or pasta, boiling over can occur. Once reason for this is that a film forms on the surface of the boiling liquid, for example cream as milk fat separates from the milk. The increased viscosity of the liquid causes the steam bubbles to form foam trapped under the film, pushing the film up and over the lip of Porcelain Milk Watcher - Notice that there is one notch on each side, and how the interior slants toward the notch Glass Milk Watcher  
The device also rattles alerting the cook that boiling is occurring. By circulating fluid the device might also prevent anything from depositing on the bottom of the pot and eventually burning. Porcelain Milk Watcher - Notice that there is one notch on each side, and how the interior slants toward the notch Stainless Steel Milk Watcher  

 

  
   
   
   
   
   
   
   
   

 

  
   
     
   
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This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
 
 
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