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Does cooking oil evaporate?

 

Shelby asks:

Does cooking oil evaporate?

The Olive Oil Source replies:

Volatile oils will evaporate in a few days or weeks, "fixed" oils are more resistant to evaporation. Most vegetable cooking oils are classified as fixed oils. However, if you set out a container of most cooking oils, it would partially evaporate very slowly over months to years leaving a sticky varnish. You can see this varnish on the sides of pots and baking pans where the process has been speeded up by heat.

Posted: November, 2005

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