Understanding the Difference Between ממצא חפציך (Mimtzo Cheftzecha), דבר דבר (Dabair Davar), and הכנה (Hachana);
(Melting ice.) freezing dry foods; freezing ice pops; automatic ice makers; freezing liquids not to lose taste or not to get spoiled;
Does It Help if One Puts Oil into the Mixture of Salt Water?;