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When an unglazed olla is filled with water, the water permeates the clay walls of the vessel, causing the olla to “sweat”. The evaporation of the sweat cools the olla and its contents. In the early 20th century, many ranches in the American Southwest used the practice of hanging an olla from a rope on the verandah in a shady, breezy spot.
Earthenware is glazed or unglazed nonvitreous pottery [2] that has normally been fired below 1,200 °C (2,190 °F). [3] Basic earthenware, often called terracotta , absorbs liquids such as water. However, earthenware can be made impervious to liquids by coating it with a ceramic glaze , and such a process is used for the great majority of ...
Terracotta, also known as terra cotta or terra-cotta [2] (Italian: [ˌtɛrraˈkɔtta]; lit. ' baked earth '; [3] from Latin terra cocta 'cooked earth'), [4] is a clay-based non-vitreous ceramic [5] fired at relatively low temperatures. It is therefore a term used for earthenware objects of certain types, as set out below.
The term includes both unglazed earthenware, fired near 600 to 700°C, and pottery with a dark brown glaze fired at over 1100 °C. [1] Onggi have been used continuously from prehistoric Korean states to the modern day; however, they primarily see use as traditional storage and ornaments today.
In the Han dynasty, pots unglazed on the exterior known as fus (now called sandy pots) were used for wet clay cooking. [1] In Japan clay pots are mentioned from the 8th century and originally referred to as nabe. As pots made from other materials entered use, the Japanese clay pots were distinguished by calling them donabe; do means clay or earth.
Additionally, the type of ceramic will affect how it will break down. Unfired clay, like mud and clay adobe, is clay that is fired under 1000°C or 1832°F. [contradictory] This type of clay is water-soluble and unstable. Earthenware is clay that has been fired between 1000–1200°C or 1832°–2192°F.
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