Absorption through Steam and Vapor
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Question
Hello! Steam and cooking - how does steam from one type of cookware affect another type of cookware?
Answer
Hello
Steam coming from a meat dish that encounters a dairy utensil, or vice versa, can impart the taste of the food into the utensil, rendering it unfit for use.
This occurs only when the steam is hot and concentrated, not dispersed in the air.
The best example is if a pot containing meat is accidentally covered with a dairy lid; the lid becomes forbidden for use and requires koshering. Since the steam inside the pot is concentrated and hot, it is considered as if the meat itself touched the lid.
Source
Shulchan Aruch Yoreh De'ah, Siman 92, Seif 7-8