Pesahim 18 - Fluid Dynamics
Rabbi Richard Hidary
Pesahim 18 · Rabbi Meir and Rabbi Eliezer – liquids do not transmit impurity · Rabbi Yose and Rabbi Shimon – liquids transmit only to food · Rabbi Yehuda – liquids transmit to vessels and food Rabbi Yehuda retracted – fully or still say transmit to food? Attempted proof from Parah of full retraction Rabbi Yose’s proof Rabbi Akiva learned from יטמא (v. 33) that food -> shelishi to food So too Rabbi Yose – יטמא (v. 34b) liquid -> food 34a and 34b apply food->liquid and liquid->food But maybe verse teaches liquid -> vessels? Even vessels don’t -> vessels יטמא (v. 34a) – food -> liquid But maybe verse teaches food -> vessels? No, liquids are just susceptible Principle of food->liquid, liquid->food from v. 38