Is ice considered food or drink in Halacha? So for example, if one would eat an kezais of ice on yom Kippur, but it would not be equal to a reviyis, would he be liable for a chatas?
From Din Online:
Poskim discuss the status of ice cream or ices–are they considered as liquids or solids? According to some poskim they are considered liquids, and would therefore be covered by the hagafen blessing (see especially Sephardi poskim: Or Le-Zion14:18; Yakut Yosef 3:177, 10; see also Ben Ish Chai, Masei 8; see also Be’er Moshe 1:11, and Vezos Ha-Berachah p.44, inthe name of Rav Elyashiv).
However, others write that they have the halachah of solids (see Shaar Ha-Zion 158:1; Mekor Ha-Berachah p.110, inthe name of the Steipler; Betzeil Ha-Chochmah 3:114, 4 distinguishes between ice creams that are made with many different ingredients, and ices that are predominantly frozen water).
Therefore, some recite a blessing over the ice cream even in a meal, and even after reciting hagafen at the beginning. This is probably the common custom among Ashkenazim. Most Sephardim do not recite a blessing on the ice cream, and leave eating the ice cream until after benching, following the ruling of Rav Ovadyah Yosef and other Sephardi poskim.
For ices that are licked and not chewed, it appears that this is certainly considered drinking and not eating, and the hagafen blessing will suffice. (My Emphasis)
From Daily Halacha:
Rabbi Moshe Stern of Debereczyn, in his work Be'er Moshe (vol. 1, 11:2), rules that Halacha indeed treats ice cream as a liquid, and not as a solid, and thus it is covered by the Beracha recited over bread or the Beracha recited over wine. This view is codified as well by Hacham Yishak Yosef in his work Kol Torah, in the name of his father, Hacham Ovadia Yosef. The work "Ve'zot Ha'beracha" (p. 100) likewise cites this ruling in the name of several leading Halachic authorities.
From Eretz Hemdah:
a few poskim make the following claim. Ice cream is a liquid that is served as a solid because people enjoy it at an artificially cold temperature. Since accepted practice is not to make a beracha on liquids during a meal, including during dessert, one should not make a beracha on ice cream. Yalkut Yosef (on OC167, 10) rules this way in the name of his father (Rav Ovadya). There are reports that Rav Moshe Feinstein ruled this way as well (see Vezot Haberacha, pg. 74). One could say that it is logical to call ice cream a liquid only when it is based heavily on milk and/or water, not when it is a mixture of eggs, soy products, and sugar (i.e., pareve ice cream) (see opinions in Piskei Teshuvot 177:(24)). Perhaps Rav Moshe was speaking about classic ice cream; however, Rav Ovadya does not accept this distinction.
It appears that many poskim treat ice-cream and frozen fruit juices (ices) as liquids for the purposes of determining whether they are exempt from brachos during a meal. This means that we would use the shiur of a revi'is when determining shiur requirements for the bracha achrona, therefore the consumption of ice on Yom Kippur would only be a violation of inuy if one consumed the equivalent of a revi'is of water once it is melted rather than the smaller kezayis shiur.