Information AboutFreezing |
| CATEGORIES ABOUT FREEZING | |
| phase changes | |
| atmospheric thermodynamics | |
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In Physics and Chemistry , freezing is the process whereby a Liquid turns to a Solid . The Freezing Point is the Temperature at which this happens. Melting , the process of turning a solid to a liquid, is the opposite of freezing. For most substances, the melting and freezing points are the same temperature. Rapid cooling by exposure to Cryogenic temperatures can cause a substance to freeze below its melting point, a process known as Flash Freezing . For some pure substances, such as Pure Water , the freezing temperature is lower than the melting temperature. The freezing point for water is only the same temperature as the Melting Point when Nucleators are present to prevent Supercooling . The freezing point of water is 0°C (32°F, 273 K). In the absence of nucleators water will supercool to as low as −70°C (−94°F, 203 K) before freezing. But in the presence of nucleating substances the freezing point of water is the same as the melting point. Nucleating agents, such as dust, are commonly present in the environment, which is why Rain water and Tap Water will normally freeze at the melting point of water. FOOD PRESERVATION See Also: Frozen food Freezing is a common method of Food Preservation which slows both food decay and the growth of Micro-organism s. Besides the effect of lower temperatures on Reaction Rate s, freezing makes water less available for Bacteria l growth. there are many forms of freezing see below for details REFERENCES SEE ALSO EXTERNAL LINKS
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