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Adding Powder To Liquids To Create A Substance On Shabbat

The Daily Halacha Moment - Adding Powder To Liquids To Create A Substance On Shabbat


״כל השונה הלכות בכל יום - מובטח לו שהוא בן העולם הבא״ (נידה עג ע״א, מגילה כח:)

“Anyone who studies Halachot every day is guaranteed that he is destined for the world-to-come” (Megilla 28b, Niddah 73a)


Question:

May one add liquid to powders on Shabbat?

Make one make instant mash potatoes on Shabbat?


Answer:

One may make milk or baby-formula from dehydrated milk on Shabbat without a shinuy.[1]


When making a porridge for a baby, it is permitted to make it normally if it is runny; however, if it is thick, one should use a shinuy when making it. [2] . It is permitted to make Jello on Shabbat by pouring hot water (from a kli sheni) onto the powder and placing it in the fridge to harden. [3] Nontheless, it is prohibited to make instant mashed potatoes on Shabbat by adding water to the potato powder, since it combines the mixture into a dough like substance.[4]


Excerpted from R’ Yonatan Nacson’s ‘Laws of Shabbat’, vol. 1 p. 388-389


Sources:

[1]. Chazon Ovadia, Shabbat, vol. 4, p. 280; Ohr LeTzion, vol. 2, 33:8. See also Shemirat Shabbat KeHilchatah 8:23 who states that this is permitted even if the powder does not dissolve immediately. See also Menuchat Ahavah, vol. 2, 9:14.

[2]. Halichot Shabbat, Malka, vol. 2, p. 521. In this case, it suffices to just pour the powder into the water, and one does not need to stir it with a shinuy.

[3]. Chazon Ovadia, Shabbat, vol. 4, p. 281.

[4]. Menuchat Ahavah, vol. 2, 9:15; Igrot Moshe, O.C. 4:74, Lash §12; Shemirat Shabbat KeHilchatah 8:30; Halichot Shabbat, Malka, vol. 2, p. 509. In this case, it does not help to use a shinuy by placing the water first since this is biblically forbidden.


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