Tuesday, June 24, 2014

The Principle of Tata'ah Gavar

The Principle of Tata'ah Gavar
Day: Tuesday
Date: June 24, 2014
Parshat: Hukat
Yalkut Yosef: 318

Our Hachamim have taught us that if two foods are stacked, the lower of them is dominant in regards to temperature. This principle is called tata'ah gavar. Therefore, on Shabbat one may pour hot water that is above yad soledet bo directly from a kli rishon into a cup of cold water even if the cold water was never heated. Since the cold water is on the bottom it cools down the hot water and is not cooked by it. Ideally there should be enough cold water already in the cup so that the hot water does not completely take over. On the flip side, one may not pour cold water into a pot of hot water as long as the water in the pot is hotter than yad soledet bo. However if there is enough cold water that it'll completely cool down the hot water below, one may pour it in. Ideally the cold water should be poured in all at once and not bit by bit.

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