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freezing |
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freezing, change of a substance from the liquid to the solid state. The temperature at which freezing occurs for a pure crystalline solid is called the freezing point and is a characteristic of the particular substance. The reverse process, the change of a solid to a liquid, is called melting. See melting point melting point, temperature at which a substance changes its state from solid to liquid. Under standard atmospheric pressure different pure crystalline solids will each melt at a different specific temperature; thus melting point is a characteristic of a substance and
..... Click the link for more information. ; refrigeration refrigeration, process for drawing heat from substances to lower their temperature, often for purposes of preservation. Refrigeration in its modern, portable form also depends on insulating materials that are thin yet effective. ..... Click the link for more information. . freezingMethod of food preservation in which low temperatures (0 °F [−18 °C] or lower) inhibit the growth of microorganisms. Used for centuries in cold regions, it was not until the advent of mechanical refrigeration in the mid 19th century that the process became widely applicable commercially. In the 20th century, quick (or flash) freezing was developed by Clarence Birdseye. Except for beef and venison, which benefit from an aging process, meat is frozen as promptly as possible after slaughter. Fruits and vegetables are often frozen in a syrup or vacuum-sealed to exclude air and prevent oxidation and desiccation. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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