When impure liquids contact the outer surface of a vessel with a receptacle — does the inner surface contract impurity?
Halacha 1 states that whenever the external surface of a vessel that has a receptacle contracts impurity from liquids, its inner side does not contract impurity.
Question 2
A pouch with an inner pocket — if the outer pocket contracts impurity from liquids, what is the inner pocket's status?
Halacha 4 states that when there is a pouch with an inner pocket and one of the two contracted impurity due to contact with impure liquids, the other does not contract impurity.
Question 3
Impure liquids falling on the upper lance surface of a plow — does the underside contract impurity?
Halacha 3 states that a concept paralleling external and inner surface applies to a plow — impure liquids on the lance do not contaminate the underside.
Question 4
Two different measurements carved from one piece of wood — if one contracts impurity from liquids, what happens to the other?
Halacha 5 states that when one carves out a revi'it and half a revi'it into one piece of wood and one contracted impurity from impure liquids, the other remains pure.
Question 5
When the outer surface of a boiling kettle is impure — do we suspect the boiling liquids inside contaminated the inner surface?
Halacha 6 states that when the outer surface of a kettle was impure and it was boiling, we do not suspect that liquids flowed out from it, touched its outer surface, and returned — creating impurity.